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Convert progressive JPG to standard

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Heather Gray

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Nov 26, 2002, 4:01:39 PM11/26/02
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Is there a utility to convert a JPG from progressive to standard compression (baseline) format? I need to do this with about 400 images, easily, and without loss of quality.

I saw an archived discussion about this but was unclear on where to find the utility or if there is one.

Thank you for any help.

Chris Cox

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Nov 26, 2002, 5:50:08 PM11/26/02
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Just use an action and the batch command.

Chris Cox

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Nov 26, 2002, 6:03:40 PM11/26/02
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Emma - yes, probably. There is no way to resave a JPEG without the possibility of losing some quality.

But if the progressive JPEG was saved in Photoshop to begin with, then resaving through Photoshop will lose the least quality.

Emma d'Anise

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Nov 26, 2002, 6:02:15 PM11/26/02
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Won't quality be lost no matter what, though, Chris, since the file resaved from a jpg to a jpg? I suppose the quality loss won't be much and hardly noticeable, but isn't there always loss when doing this?

~Em

Heather Gray

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Nov 26, 2002, 6:11:09 PM11/26/02
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OK, it looks like it's time for me to learn how to set up an action and the batch command.

Originally I used "Save for Web," I wonder if it matters whether I use this or "Save As?" I think I'll need to use "Save for Web" because that is where the option to select progressive jpg is located. Will I be able to automate re-saving at the same file size/compression?

I'd heard that IE doesn't support progressive jpgs, which would have been great because then I could leave the images as is. But we just did a test on Mac IE and we can see the images loading progressively. Darn.

Heather

Daryl Pritchard

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Nov 26, 2002, 8:07:24 PM11/26/02
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Heather,

From what I can tell, IE6 at the very least will support progressive JPEGs with the Windows O/S. I thought IE compatability with p-JPEGs went back to IE4, but it may be true only back to IE5. Here's a link that may be of interest: <http://www.faqs.org/faqs/jpeg-faq/part2/section-16.html>

Regards,

Daryl

Heather Gray

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Nov 26, 2002, 8:09:36 PM11/26/02
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My research shows that Windows IE does not support progressive JPGs, Mac IE and Netscape do.

Hrishikesh Deshmukh

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Dec 5, 2002, 7:30:36 PM12/5/02
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Hi there,
Is there any way of finding out whether a particular image is a progressive jpeg or a standard(baseline) jpeg?

Thanks!
Hrishi

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