Photoshop CS Question

SW
Posted By
Steven Wandy
Jan 6, 2004
Views
365
Replies
7
Status
Closed
I just got the Olympus E1. When I shoot in highest quality JPEG the files sizes are usually between 3 and 4 MB. I open the images in PS-CS, do whatever I wish to them and resave as JPEG at highest quality level (12). The resulting images are usually between 5 and 6 MB.
(1) What is the reason for the increase?
(2) Would it make more sense to lower the quality of the level that PSCS saves the file in to get back to around the original size? Thanks
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S
Stephan
Jan 6, 2004
"Steven Wandy" wrote in message
I just got the Olympus E1. When I shoot in highest quality JPEG the files sizes are usually between 3 and 4 MB. I open the images in PS-CS, do whatever I wish to them and resave as JPEG at highest quality level (12). The resulting images are usually between 5 and 6 MB.
(1) What is the reason for the increase?

Probably a different way of compressing, not sure.

(2) Would it make more sense to lower the quality of the level that PSCS saves the file in to get back to around the original size?

Not at all, why would you want to degrade your pictures? Jpeg is for web, save your pictures as Tiff.

Stephan
MD
Mike Davis
Jan 7, 2004
I’m not familiar with the E-1, but I suspect the maximum JPEG being used by the E-1 is lower than 12. Try loading the image into PS CS and immediately click on "Save As" and see what the JPEG offering is in the window.
R
replytonewsgrouponlyplease
Jan 7, 2004
(1) What is the reason for the increase?

The original files are compressed more. To compare, in the PS save dialog they’d probably be in the ‘high’ range as apposed to the ‘maximum’ range that you’re resaving them in. I guess it saves space on your camera card.

(2) Would it make more sense to lower the quality of the level that PSCS saves the file in to get back to around the original size?

Is there a reason you want to get it back to the original size? To be clear, the original size (pixel x pixel) of the image doesn’t change, just the amount of disc space it takes up does.

As for your question, it depends. Jpeg is a lossy format and as such is best used to save disc space (or bandwidth) only AFTER you are completely done editing. Every time you open a jpeg image, make changes and save it again (recompress it) as a jpeg you will lower the quality of the image. Tiff is probably the most widely used lossless format and will allow you to save layers and masks though this will increase its size on disc. As well tiff can use LZW compression to lower it’s size which works to varying degrees, usually.
R
replytonewsgrouponlyplease
Jan 7, 2004
"mdavis" wrote in message
I’m not familiar with the E-1, but I suspect the maximum JPEG being used
by
the E-1 is lower than 12. Try loading the image into PS CS and
immediately
click on "Save As" and see what the JPEG offering is in the window.

Does the dialog box not offer up the last used setting?
A
AKsteve
Jan 7, 2004
Sounds like you are saving these for web viewing. If you want to print them it would be better to save them as tiffs – file size will be much larger but quality will be better.

Anyway, I would suggest using the "save for web" command under the file menu. Once there, you can mess with the jpg settings to get the size and quality you want.

Steve

"Steven Wandy" wrote in message
I just got the Olympus E1. When I shoot in highest quality JPEG the files sizes are usually between 3 and 4 MB. I open the images in PS-CS, do whatever I wish to them and resave as JPEG at highest quality level (12). The resulting images are usually between 5 and 6 MB.
(1) What is the reason for the increase?
(2) Would it make more sense to lower the quality of the level that PSCS saves the file in to get back to around the original size? Thanks

MD
Mike Davis
Jan 7, 2004
Sure, but the bottom of the window will give you the filesize for comparison. You can switch JPEG compressions settings and see what is closest to the JPEG from the camera for the unaltered image.
S
Stephan
Jan 7, 2004
"AKsteve" wrote in message
Sounds like you are saving these for web viewing. If you want to print
them
it would be better to save them as tiffs – file size will be much larger
but
quality will be better.

No, you won’t see a difference when you print.

snip<

Stephan

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