JPEG Format

My cameras color space is RGB and I use Photoshop Elements 3 for some minor post editing.
Question is---after post editing in Photoshop Elements 3 I save my images for printing in a JPEG format.
I am given 2 choices----baseline standard or baseline optimized which optimizes the color quality.
Which is better for color printing. What is optimized? Change in the RGB color space? Change in the color gamut?
Comments appreciated.
Richard Cooper

Richard.....
The basic difference between the two compression options is the degree to which they actually comress the file size. Optimised supposedly produces a slightly smaller file size. Although the description states 'optimises the colour quality' I think this is misleading.
JPEG compression is known as a lossy format in that it throws away data, specifically it throws away more colour data than luminance or let's say the B&W component. It does this very cleverly and very well providing you don't compress the image too much - at which point it will become very blocky and unsharp. You'll notice large jumps between colours that should have smooth transitions.
I think what the Optimised setting is doing - is providing a more compressed image but trying to retain some colour fidelity. It does not change the Colour Space.
Either way for printing you should choose the Highest Baseline Standard setting possible. The rule is - more compression > lower quality.
If you're sending this out you might want to check with the Lab if they have any preference as to what Colour Space you should provide.
Colin

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Chris Cox wrote:
Where did you get the idea that we weren't doing something about it?
that's what I gathered from "JPEG cannot [...] in Photoshop (code difficult to replace)".
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Chris Cox wrote:
And where did you get the idea that posts get deleted? (other than SPAM)
Are you sure you're reading the same forum as the rest of us?
That's what happened:
The content you posted below was reported for abuse and removed by our
moderators:
Subject: Re: Is there a practical size limit on JPEG format image files?
Posted: 4/29/11 9:11 AM
Anyway, you gave an honest answer on this technical issue, Chris, and that's what counts.

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