How to Master Sharpening in Photoshop
Give your photos a professional finish with sharpening in Photoshop. Learn to enhance details, create contrast, and prepare your images for print, web, and social media.
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Give your photos a professional finish with sharpening in Photoshop. Learn to enhance details, create contrast, and prepare your images for print, web, and social media.
(I thinkYour Photo Editing Program COMPRESSED your image more than it was originally.
I’m puzzled with such operation: I apply auto levels to some jpgs from my digital camera (1600×1200 pixel), with file size about 600K, and I get file size about 300K!
Someone can explain?
il barbi
(I think
I’m puzzled with such operation: I apply auto levels to some jpgs from my digital camera (1600×1200 pixel), with file size about 600K, and I get file size about 300K!
Someone can explain?
il barbi
"il barbi" wrote:
(I think
I’m puzzled with such operation: I apply auto levels to some jpgs from my digital camera (1600×1200 pixel), with file size about 600K, and I get file
size about 300K!
Someone can explain?
il barbi
The question should be about the "SIZE" *not* "Auto Level" as Auto Level has nothing to do with the size decreasing.
The In/Decreasing size usually depend on the COMPRESSION. Or if you want to save at the best quality or largest size then tell Photoshop to save to quality 12 (I think 12 is the highest number), and if you want to reduce the
size/quality then set to lower number lower than 12.
il barbi wrote:Of course I’m using Photoshop, this is a NG about Photoshop, isn’t it? Now I get a file from my digital camera, say org.jpg, size 599K, 1600×1200 pixels = about 2Mpixels, I enter Photoshop, open org.jpg and choose autolevels, then file – close, it asks me "Save the modifications?", I choose yes and I get org.jpg with size 375K I thought it must have expanded the file as a bitmap, applied auto level by scaling the 3 RGB bytes representing each pixel, then re-compressed the file at the same degreee as at beginning (it did not ask me the jpg compression level)
(I thinkYour Photo Editing Program COMPRESSED your image more than it was originally.
I’m puzzled with such operation: I apply auto levels to some jpgs from my digital camera (1600×1200 pixel), with file size about 600K, and I get file size about 300K!
Someone can explain?
il barbi
In Photoshop, and probably others, you can choose the degree of compression you want in the SAVED image.
Tell us what photo Editor you are using and maybe someone can tell you how to control the compression.
I only know Photoshop, but many in this NG have used every imaginable photo editor. They can surely help you.
Bob Williams
Now I get a file from my digital camera, say org.jpg, size 599K, 1600×1200 pixels = about 2Mpixels, I enter Photoshop, open org.jpg and choose autolevels, then file – close, it asks me "Save the modifications?", I choose yes and I get org.jpg with size 375K I thought it must have expanded the file as a bitmap, applied auto level by scaling the 3 RGB bytes representing each pixel, then re-compressed the file at the same degreee as at beginning (it did not ask me the jpg compression level)
but why is the size about halved?
il barbi
"Joe" wrote in message
"il barbi" wrote:
(I think
I’m puzzled with such operation: I apply auto levels to some jpgs from my digital camera (1600×1200 pixel), with file size about 600K, and I get file
size about 300K!
Someone can explain?
il barbi
The question should be about the "SIZE" *not* "Auto Level" as Auto Level has nothing to do with the size decreasing.
The In/Decreasing size usually depend on the COMPRESSION. Or if you want to save at the best quality or largest size then tell Photoshop to save to quality 12 (I think 12 is the highest number), and if you want to reduce the
size/quality then set to lower number lower than 12.
Basically you never want to keep saving jpg’s from jpg’s as with each compression the image will degrade (how much and if it is visible is a debate)(and one advantage of shooting RAW)
from camera if you have jpg save to a lossless format like TIF or PSD to make your changes then save copies from those
or as suggested save to a higher quality jpg if you must save jpg to jpg
"Bob Williams" ha scritto nel messaggioAfter you do your Auto Levels operation.
il barbi wrote:Of course I’m using Photoshop, this is a NG about Photoshop, isn’t it? Now I get a file from my digital camera, say org.jpg, size 599K, 1600×1200 pixels = about 2Mpixels, I enter Photoshop, open org.jpg and choose autolevels, then file – close, it asks me "Save the modifications?", I choose yes and I get org.jpg with size 375K I thought it must have expanded the file as a bitmap, applied auto level by scaling the 3 RGB bytes representing each pixel, then re-compressed the file at the same degreee as at beginning (it did not ask me the jpg compression level)
(I thinkYour Photo Editing Program COMPRESSED your image more than it was originally.
I’m puzzled with such operation: I apply auto levels to some jpgs from my digital camera (1600×1200 pixel), with file size about 600K, and I get file size about 300K!
Someone can explain?
il barbi
In Photoshop, and probably others, you can choose the degree of compression you want in the SAVED image.
Tell us what photo Editor you are using and maybe someone can tell you how to control the compression.
I only know Photoshop, but many in this NG have used every imaginable photo editor. They can surely help you.
Bob Williams
but why is the size about halved?
il barbi
il barbi wrote:saved the file with quality 12 – the pixels are still 1600×1200 and file size 1069K (!)
"Bob Williams" ha scritto nel messaggioAfter you do your Auto Levels operation.
il barbi wrote:Of course I’m using Photoshop, this is a NG about Photoshop, isn’t it? Now I get a file from my digital camera, say org.jpg, size 599K, 1600×1200
(I thinkYour Photo Editing Program COMPRESSED your image more than it was originally.
I’m puzzled with such operation: I apply auto levels to some jpgs from my digital camera (1600×1200 pixel), with file size about 600K, and I get file size about 300K!
Someone can explain?
il barbi
In Photoshop, and probably others, you can choose the degree of compression you want in the SAVED image.
Tell us what photo Editor you are using and maybe someone can tell you how to control the compression.
I only know Photoshop, but many in this NG have used every imaginable photo editor. They can surely help you.
Bob Williams
pixels = about 2Mpixels, I enter Photoshop, open org.jpg and choose autolevels, then file – close, it asks me "Save the modifications?", I choose yes and I get org.jpg with size 375K I thought it must have expanded the file as a bitmap, applied auto level by scaling the 3 RGB bytes representing each pixel, then re-compressed the file at the same degreee as at beginning (it did not ask me the jpg compression level)
but why is the size about halved?
il barbi
Try the FILE >>> SAVE AS option and then select the highest quality. Check the number of pixels then.
Bob
After you do your Auto Levels operation.saved the file with quality 12 – the pixels are still 1600×1200 and file size 1069K (!)
Try the FILE >>> SAVE AS option and then select the highest quality. Check the number of pixels then.
Bob
il barbi
"Bob Williams" ha scritto nel messaggio
il barbi wrote:Of course I’m using Photoshop, this is a NG about Photoshop, isn’t it? Now I get a file from my digital camera, say org.jpg, size 599K, 1600×1200 pixels = about 2Mpixels, I enter Photoshop, open org.jpg and choose autolevels, then file – close, it asks me "Save the modifications?", I choose yes and I get org.jpg with size 375K
(I thinkYour Photo Editing Program COMPRESSED your image more than it was originally.
I’m puzzled with such operation: I apply auto levels to some jpgs from my digital camera (1600×1200 pixel), with file size about 600K, and I get file size about 300K!
Someone can explain?
il barbi
In Photoshop, and probably others, you can choose the degree of compression you want in the SAVED image.
Tell us what photo Editor you are using and maybe someone can tell you how to control the compression.
I only know Photoshop, but many in this NG have used every imaginable photo editor. They can surely help you.
Bob Williams
"il barbi" wrote:
<snip>
After you do your Auto Levels operation.saved the file with quality 12 – the pixels are still 1600×1200 and file size 1069K (!)
Try the FILE >>> SAVE AS option and then select the highest quality. Check the number of pixels then.
Bob
il barbi
And now it may be the best chance to ask and learn WHY the 1600×1200 doesn’t mean much. It seems like you *still* haven’t got the clue why 1600×1200 doesn’t mean much.
"Bob Williams" ha scritto nel messaggioYes! I misspoke.
il barbi wrote:saved the file with quality 12 – the pixels are still 1600×1200 and file size 1069K (!)
"Bob Williams" ha scritto nel messaggioAfter you do your Auto Levels operation.
il barbi wrote:Of course I’m using Photoshop, this is a NG about Photoshop, isn’t it? Now I get a file from my digital camera, say org.jpg, size 599K, 1600×1200
(I thinkYour Photo Editing Program COMPRESSED your image more than it was originally.
I’m puzzled with such operation: I apply auto levels to some jpgs from my digital camera (1600×1200 pixel), with file size about 600K, and I get file size about 300K!
Someone can explain?
il barbi
In Photoshop, and probably others, you can choose the degree of compression you want in the SAVED image.
Tell us what photo Editor you are using and maybe someone can tell you how to control the compression.
I only know Photoshop, but many in this NG have used every imaginable photo editor. They can surely help you.
Bob Williams
pixels = about 2Mpixels, I enter Photoshop, open org.jpg and choose autolevels, then file – close, it asks me "Save the modifications?", I choose yes and I get org.jpg with size 375K I thought it must have expanded the file as a bitmap, applied auto level by scaling the 3 RGB bytes representing each pixel, then re-compressed the file at the same degreee as at beginning (it did not ask me the jpg compression level)
but why is the size about halved?
il barbi
Try the FILE >>> SAVE AS option and then select the highest quality. Check the number of pixels then.
Bob
il barbi
Yes! I misspoke.After you do your Auto Levels operation.saved the file with quality 12 – the pixels are still 1600×1200 and file size 1069K (!)
Try the FILE >>> SAVE AS option and then select the highest quality. Check the number of pixels then.
Bob
il barbi
The number of pixels does NOT change.
The number of kilobytes needed to describe the pixels does. That is what Compression is all about.
High Compression = Fewer kilobytes….Low Compression = More kilobytes If you want to get a feel for how compression affects the file size in kilobytes, take any picture from your camera, look at the file size. Do an Auto Levels or anything else and SAVE AS (give it a new name e.g. pic2.) and select the highest compression (Image quality = 0) Now just SAVE AS again. Call it pic3 and select the Lowest compression (Image Quality = 12)
Now compare the file size for each image…The differences in file size are huge. The number of pixels remains the same.
Bob
il barbi wrote:I found where is the problem – I was using PS rel.6.0… You can verify, if you want, that after applying autolevels to org.jpg and closing the file, PS
"Bob Williams" ha scritto nel messaggioYes! I misspoke.
il barbi wrote:saved the file with quality 12 – the pixels are still 1600×1200 and file size 1069K (!)
"Bob Williams" ha scritto nel messaggioAfter you do your Auto Levels operation.
il barbi wrote:Of course I’m using Photoshop, this is a NG about Photoshop, isn’t it? Now I get a file from my digital camera, say org.jpg, size 599K, 1600×1200
(I thinkYour Photo Editing Program COMPRESSED your image more than it was originally.
I’m puzzled with such operation: I apply auto levels to some jpgs from my digital camera (1600×1200 pixel), with file size about 600K, and I get file size about 300K!
Someone can explain?
il barbi
In Photoshop, and probably others, you can choose the degree of compression you want in the SAVED image.
Tell us what photo Editor you are using and maybe someone can tell you how to control the compression.
I only know Photoshop, but many in this NG have used every imaginable photo editor. They can surely help you.
Bob Williams
pixels = about 2Mpixels, I enter Photoshop, open org.jpg and choose autolevels, then file – close, it asks me "Save the modifications?", I choose yes and I get org.jpg with size 375K I thought it must have expanded the file as a bitmap, applied auto level by scaling the 3 RGB bytes representing each pixel, then re-compressed the file at the same degreee as at beginning (it did not ask me the jpg compression level)
but why is the size about halved?
il barbi
Try the FILE >>> SAVE AS option and then select the highest quality. Check the number of pixels then.
Bob
il barbi
The number of pixels does NOT change.
The number of kilobytes needed to describe the pixels does. That is what Compression is all about.
High Compression = Fewer kilobytes….Low Compression = More kilobytes If you want to get a feel for how compression affects the file size in kilobytes, take any picture from your camera, look at the file size. Do an Auto Levels or anything else and SAVE AS (give it a new name e.g. pic2.) and select the highest compression (Image quality = 0)
Now just SAVE AS again. Call it pic3 and select the Lowest compression (Image Quality = 12)
Now compare the file size for each image…The differences in file size are huge. The number of pixels remains the same.
il barbi wrote:
"Bob Williams" ha scritto nel messaggio
il barbi wrote:Of course I’m using Photoshop, this is a NG about Photoshop, isn’t it? Now I get a file from my digital camera, say org.jpg, size 599K, 1600×1200
(I thinkYour Photo Editing Program COMPRESSED your image more than it was originally.
I’m puzzled with such operation: I apply auto levels to some jpgs from my digital camera (1600×1200 pixel), with file size about 600K, and I get file size about 300K!
Someone can explain?
il barbi
In Photoshop, and probably others, you can choose the degree of compression you want in the SAVED image.
Tell us what photo Editor you are using and maybe someone can tell you how to control the compression.
I only know Photoshop, but many in this NG have used every imaginable photo editor. They can surely help you.
Bob Williams
pixels = about 2Mpixels, I enter Photoshop, open org.jpg and choose autolevels, then file – close, it asks me "Save the modifications?", I choose yes and I get org.jpg with size 375K
You ignored the levels of compression available.
OK barbi once againplease see my text of aug.13, 22h49′
cut <
do you get it?
"Kabuki" ha scritto nel messaggio
OK barbi once againplease see my text of aug.13, 22h49′
cut <
do you get it?
anyway suppose you have such jpg and want to apply autolevels and save, what would you do?
il barbi
"Kabuki" ha scritto nel messaggio
OK barbi once againplease see my text of aug.13, 22h49′
cut <
do you get it?
anyway suppose you have such jpg and want to apply autolevels and save, what would you do?
il barbi
"Kabuki" ha scritto nel messaggio
OK barbi once againplease see my text of aug.13, 22h49′
cut <
do you get it?
anyway suppose you have such jpg and want to apply autolevels and save, what would you do?
il barbi
now my problem is mainly for a peculiar job – I use to photograph old documents in a historical archive (ok it would be better to set some copy stand with 45anyway suppose you have such jpg and want to apply autolevels and save, what would you do?
il barbi
I use a different workflow (open in Bridge>use ACR>>make the batch adjustment.. Save as >tiff
and I very rarely use auto level
it is like using the camera to make the exposure and aperture decisions (auto settings)
I use curves if I am opened in PS- I resisted that for a long time until I learned it’s superiority
"Bob Williams" ha scritto nel messaggioSince your Fuji outputs a 2MP image, and it takes 3 bytes (RGB) to describe a pixel, a totally uncompressed file would be 6 megabytes. But your camera compresses the image to 600 KB. So Fuji’s algorithm uses ABOUT a 10:1 compression. (Actual compression ratio depends on the image content). 10:1 is a pretty high compression ratio. Perhaps you are NOT using the Finest Quality setting on your camera.
il barbi wrote:I found where is the problem – I was using PS rel.6.0… You can verify, if you want, that after applying autolevels to org.jpg and closing the file, PS
"Bob Williams" ha scritto nel messaggioYes! I misspoke.
il barbi wrote:saved the file with quality 12 – the pixels are still 1600×1200 and file size 1069K (!)
"Bob Williams" ha scritto nel messaggioAfter you do your Auto Levels operation.
il barbi wrote:Of course I’m using Photoshop, this is a NG about Photoshop, isn’t it? Now I get a file from my digital camera, say org.jpg, size 599K, 1600×1200
(I thinkYour Photo Editing Program COMPRESSED your image more than it was originally.
I’m puzzled with such operation: I apply auto levels to some jpgs from my digital camera (1600×1200 pixel), with file size about 600K, and I get file size about 300K!
Someone can explain?
il barbi
In Photoshop, and probably others, you can choose the degree of compression you want in the SAVED image.
Tell us what photo Editor you are using and maybe someone can tell you how to control the compression.
I only know Photoshop, but many in this NG have used every imaginable photo editor. They can surely help you.
Bob Williams
pixels = about 2Mpixels, I enter Photoshop, open org.jpg and choose autolevels, then file – close, it asks me "Save the modifications?", I choose yes and I get org.jpg with size 375K I thought it must have expanded the file as a bitmap, applied auto level by scaling the 3 RGB bytes representing each pixel, then re-compressed the file at the same degreee as at beginning (it did not ask me the jpg compression level)
but why is the size about halved?
il barbi
Try the FILE >>> SAVE AS option and then select the highest quality. Check the number of pixels then.
Bob
il barbi
The number of pixels does NOT change.
The number of kilobytes needed to describe the pixels does. That is what Compression is all about.
High Compression = Fewer kilobytes….Low Compression = More kilobytes If you want to get a feel for how compression affects the file size in kilobytes, take any picture from your camera, look at the file size. Do an Auto Levels or anything else and SAVE AS (give it a new name e.g. pic2.) and select the highest compression (Image quality = 0)
Now just SAVE AS again. Call it pic3 and select the Lowest compression (Image Quality = 12)
Now compare the file size for each image…The differences in file size are huge. The number of pixels remains the same.
6.0 does not ask what level of compression is to be chosen, in the contrary
PS 7.0 does. Moreover PS 6.0 assumes the current level of compression, which may vary between 1 and 12 depending on the last operation involving the request of this parameter. So by doing autolevels+close the result may vary very much. I don’t know if this is a bug of PS 6.0 or a problem of my PS installation, anyway it is better to pass away, I’ll use PS 7.0. Now my question arose from this problem: I want to apply autolevels to the jpg files from my Fuji digital camera (this is a compact one, no raw output). I don’t know what jpg algorithm Fuji applies to the 2Mpixel of each photo, I only know the photos occupy about 600K. Now since autolevel function only applies some scaling to each group of 3 bytes representing each pixel, I expect to get more or less the same memory size but I don’t want to add a further loss to the loss that Fuji has already caused. On the other side if I save the autoleveled file with maximum (12) degree I get a much greater filesize (1069K for the 599K file I quoted) and this seems nonsense
il barbi
Since your Fuji outputs a 2MP image, and it takes 3 bytes (RGB) to describe a pixel, a totally uncompressed file would be 6 megabytes. But your camera compresses the image to 600 KB. So Fuji’s algorithm uses ABOUT a 10:1 compression. (Actual compression ratio depends on the image content). 10:1 is a pretty high compression ratio. Perhaps you are NOT using the Finest Quality setting on your camera.ok I’m not using the finest quality, this is only allowed with 12Mpixels and results in files of 6 MBytes, with a compression ratio of about 6:1. There is also the "normal" quality with 12Mpixels, leading to 3MB files (compression ratio 12:1). But my problem is not to achieve maximum quality, as I hope to made it understand (apart of my poor english language). I’m just satisfied with 2Mpixels in a peculiar task of photographing old documents, as I tell in another branch of this thread, with jpg size 600K. The original problem I told at the beginning was due to some bad behaviour of PS 6.0 leading to 300K jpgs with further loss of data. Now the problem is to improve the 600K resulting jpgs, since they are too dark, hopefully without further loss of data and memory increasing
"Bob Williams" ha scritto nel messaggio
Since your Fuji outputs a 2MP image, and it takes 3 bytes (RGB) to describe a pixel, a totally uncompressed file would be 6 megabytes. But your camera compresses the image to 600 KB. So Fuji’s algorithm uses ABOUT a 10:1 compression. (Actual compression ratio depends on the image content). 10:1 is a pretty high compression ratio. Perhaps you are NOT using the Finest Quality setting on your camera.ok I’m not using the finest quality, this is only allowed with 12Mpixels and results in files of 6 MBytes, with a compression ratio of about 6:1. There is also the "normal" quality with 12Mpixels, leading to 3MB files (compression ratio 12:1). But my problem is not to achieve maximum quality, as I hope to made it understand (apart of my poor english language). I’m just satisfied with 2Mpixels in a peculiar task of photographing old documents, as I tell in another branch of this thread, with jpg size 600K. The original problem I told at the beginning was due to some bad behaviour of PS 6.0 leading to 300K jpgs with further loss of data. Now the problem is to improve the 600K resulting jpgs, since they are too dark, hopefully without further loss of data and memory increasing
il barbi
thank you, this is the link:Now the problem is
to improve the 600K resulting jpgs, since they are too dark, hopefully without further loss of data and memory increasing
il barbi
This does not sound difficult at all. Put one of the images up on flickr.com, or a similar service, and we’ll see what we can do.
"Mike Russell" ha scritto nel messaggio
thank you, this is the link:Now the problem is
to improve the 600K resulting jpgs, since they are too dark, hopefully without further loss of data and memory increasing
il barbi
This does not sound difficult at all. Put one of the images up on flickr.com, or a similar service, and we’ll see what we can do.
http://rapidshare.de/files/48133071/DSCF2763.jpg.html
"Kabuki" ha scritto nel messaggioIf you just want to make the picture lighter without using AUTO LEVELS in post processing, just set the exposure compensation to produce a lighter image……….OR…….
now my problem is mainly for a peculiar job – I use to photograph old documents in a historical archive (ok it would be better to set some copy stand with 45° lights and tripod but it is not allowed), I set my Fuji F100fd to shooting mode "museum" (no flash, no beep), 2Mpixel are enough for a single page, I get jpg files sized about 600K with good resolution but too dark, so I used to postprocess them with such batch: "rotate 90° right – autolevels – save" and I noticed that the size became about a half (300K). As I said, this was a problem of PS 6.0 and I understand I must specify the degree of jpg compression and that this will introduce a new loss in data. I understand most people in this thread blame using jpgs and support lossless formats but I must also take care of disk occupation, 600K is a tolerable size for just one page. Now I’d like to make my photos lighter without memory increasing and further loss of data. If I apply autolevels, or any other lightening operation, and save as tiff or even jpg-12 I get much greater sizes…anyway suppose you have such jpg and want to apply autolevels and save, what would you do?I use a different workflow (open in Bridge>use ACR>>make the batch adjustment.. Save as >tiff
il barbi
and I very rarely use auto level
it is like using the camera to make the exposure and aperture decisions (auto settings)
I use curves if I am opened in PS- I resisted that for a long time until I learned it’s superiority
il barbi
– in 4 materials (clay versions included)
– 12 scenes
– 48 MacBook Pro 16″ mockups
– 6000 x 4500 px
Nice and short text about related topics in discussion sections