Various "Save" options for JPEG file

A
Posted By
Aloha
May 15, 2005
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333
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What is the difference between the 3 different options when saving a JPEG file? I mostly do printing with my images to create greeting cards on Epson Glossy Photo Paper. Is one of these options *better* than another?

They are:

Baseline Standard
Baseline Optimized
Progressive.

Thanks, Gene

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T
Tacit
May 15, 2005
In article <jXMhe.14748$>,
"Aloha" wrote:

What is the difference between the 3 different options when saving a JPEG file? I mostly do printing with my images to create greeting cards on Epson Glossy Photo Paper. Is one of these options *better* than another?
They are:

Baseline Standard
Baseline Optimized
Progressive.

If you are making images for print, you should not really be using JPEG at all. JPEG images are degraded in quality; they are intended for situations where the quality of the image is not important and the size of the file is important.

In any event, an image that has been op[ened in Photoshop is no longer a JPEG; it is just a collection of pixels sitting in memory, and the saving options that the file was created with do not matter.

To answer your question:

Baseline Standard is a plain old ordinalry JPEG. It works with anything anywhere that can read JPEG files.

Baseline Optimized is a JPEG that has been optimized for smaller file size. Some very, very old browsers, like Netscape 1.0, may have trouble showing an optimized JPEG.

Progressive is intended for large JPEG files that will be downloaded on slow dial-up connections. It works by first downloading a very low resolution, crude, fuzzy image, so that people on a slow dialup can immediately get some sort of sense of what the image looks like; then, as more of the image downloads, the file gets sequentially sharper and sharper.

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S
stillconfused
May 16, 2005
tacit wrote:

Baseline Standard is a plain old ordinalry JPEG. It works with anything anywhere that can read JPEG files.

Baseline Optimized is a JPEG that has been optimized for smaller file size. Some very, very old browsers, like Netscape 1.0, may have trouble showing an optimized JPEG.

Did you mean that saving as Baseline Optimized would produce smaller files than saving as Baseline Standard? If yes, how much smaller will the files be?
For browsers that do not have problems showing either, what is the quality difference between the two, if any?
T
Tacit
May 16, 2005
In article , wrote:

Did you mean that saving as Baseline Optimized would produce smaller files than saving as Baseline Standard? If yes, how much smaller will the files be?

Yes. Typically, they are not much smaller, and the size difference will vary from image to image; best thing to do is experiment.

For browsers that do not have problems showing either, what is the quality difference between the two, if any?

Assuming both JPEGs are saved at the same quality, both the Baseline Standard and Baseline Optimized will be the same quality.

I always use Baseline Optimized; i haven’t encountered a browser that won’t read them for…oh, eleven years or so.

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CF
Craig Flory
May 18, 2005
Tacit’ gave you some (sort of) incorrect advice. I’m a professional photographer … and always send my images, to the pro color lab, as .jpgs. They are full resolution, 12 level, and at 250ppi. I send them over the net using ftp service. I have to preface all that by saying that I first save an image as a .tif and / or .psd. If you need to re-work an image do it on one of those. Then replace the .jpg with the updated version. This way you are not saving a degraded version.

Craig Flory
K
KatWoman
May 18, 2005
I use the same method for ftp, my printers want 300 dpi jpg at size of the print.
I always save my original, and a layered psd file with all adjustments and retouching and not cropped in case I need to revise the cropping later or someone needs the full original, and a cropped, flattened tiff in print size and hi-res, plus a small jpg copy of that for web display or preview folder. Even zipped psd and tiff are usually to large file size to send over the net.

"Craig Flory" wrote in message
Tacit’ gave you some (sort of) incorrect advice. I’m a professional photographer … and always send my images, to the pro color lab, as .jpgs.
They are full resolution, 12 level, and at 250ppi. I send them over the net
using ftp service. I have to preface all that by saying that I first save an
image as a .tif and / or .psd. If you need to re-work an image do it on one
of those. Then replace the .jpg with the updated version. This way you are not saving a degraded version.

Craig Flory

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