photoshop jpg vs nikon capture jpg

R
Posted By
RBB
Aug 5, 2003
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281
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3
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hello
i like to work out the images in photoshop, but i find out that, when saving images as jpg, photoshop gives me almost half of the quality of nikon capture, lets say, if photoshop gives me a file of 5mb (at maximum quality) capture gives me a file of 10mb,

somebody knows if this is a big significance in loss of quality??

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R
RBB
Aug 5, 2003
well i did tried, but at 20cmx25cm only
is kind of hard to see the diference, looks like i got better quality by capture, but can be only my imagination, i have to wait until i can make some proofs at 50cmx60cm, unless somebody knows by experience regards
richard

"Johan W. Elzenga" escribi
T
Trev
Aug 5, 2003
"RBB" wrote in message
well i did tried, but at 20cmx25cm only
is kind of hard to see the diference, looks like i got better quality by capture, but can be only my imagination, i have to wait until i can make some proofs at 50cmx60cm, unless somebody knows by experience regards
richard
Jpeg is a lossy compression format. In a nutshell it look’s for pixels of simpler hue and lightness. notes there position saves one and throws the rest away. The setting you use dictates how close to similarity. At a low setting and done once you can have a good image with a low file size for posting or storing. But any further editing and saving will destroy more detail.

Jpeg 2000 gives better results for same compression But is not as widely supported as yet.
F
Fred
Aug 6, 2003
RBB wrote:

well i did tried, but at 20cmx25cm only
is kind of hard to see the diference, looks like i got better quality by capture, but can be only my imagination, i have to wait until i can make some proofs at 50cmx60cm, unless somebody knows by experience regards
richard

A common approach to compare compressed versions with the original ist to put them into layers and stack them above each other, then setting layer modes appropriately.

The original goes to the bottom, its layer mode is set to ‘normal’.

Above the original you stack the compressed (e.g. JPEG) copies, their layer mode each set to ‘difference’.

Now you switch of every layer but the original and one of the compressed copies. The more non-black features you see, the less fidelity in the compressed image compared to the original.

(Two originals stacked abobe each other – topmost in difference mode – would give you a completely black image).

Do this with each of the compressed versions. The brighter the resulting image, the worse the compression in terms of quality.

I must note though that this method does not take into account how our psychovisual system works, where some differences are more visible than other differences (e.g. brightness vs. hue, hue vs. saturation). But overall it can be helpful.

HTH,
Fred

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