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Windows 7: jpg compression quality in windows 7 poorer than xp

10 May 2010   #21
zzz2496

Windows7 Ultimate 64bit
 
 

Can you make a screenshot of the issue in action? I looked at my own jpegs, it is normal as far as image quality goes... I don't see any image degradation in anyway... If I use Picasa's Preview, when I zoomed in - it will apply a light gaussian blur to the image, making it to look a bit smoother...

zzz2496


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12 May 2010   #22
16cowboy

Windows 7
 
 

Its NOT a display or graphics issue.

When using the email photos button at top or side of the windows folder, this creates an email (in outlook or default program) with the photos already attached.

Its these photos from Windows 7 have more compression, distortion, and are overall less smooth. See my comparison attached.


Attached Thumbnails
jpg compression quality in windows 7 poorer than xp-xp7compare.jpg  
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12 May 2010   #23
16cowboy

Windows 7
 
 

Click the image I attached to see. To me it is quite plain & easy to see. There IS a difference. I created this by using the same method, one using XP, one using 7.
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12 May 2010   #24
mitchell65

Microsoft Windows 7 Home Premium 64-bit 7601 Multiprocessor Free Service Pack 1
 
 

I have looked at this carefully and frankly I can't see any difference at all!
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12 May 2010   #25
zzz2496

Windows7 Ultimate 64bit
 
 

I do see very small difference, yes it's compression artifact... But why can't I reproduce your issue with my paint? I created a screenshot of my desktop for this thread, I don't see any artifacts in my picture... can you? It's made with MS Paint, installed with Windows 7 Ultimate x64...

zzz2496
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12 May 2010   #26
Arc

Microsoft Community Contributor Award Recipient

Microsoft Windows 10 Pro Insider Preview 64-bit
 
 

Quote   Quote: Originally Posted by 16cowboy View Post
Its NOT a display or graphics issue.

When using the email photos button at top or side of the windows folder, this creates an email (in outlook or default program) with the photos already attached.

Its these photos from Windows 7 have more compression, distortion, and are overall less smooth. See my comparison attached.
Really ... there is a little difference but why ... it is to think ....
My System SpecsSystem Spec
17 May 2010   #27
FliGi7

XP / Win7 x64 Pro
 
 

I should clarify (not sure if I already have), that this zooming problem is when zooming to the point that the image has to be upscaled (i.e. to the point where it goes past the intended resolution). This zooming problem does not occur until the image reaches this point. Therefore, the problem exists in the way Win 7 upscales (or whatever you want to call it) an image as compared to XP. Zooming in on a high resolution image within its intended range of display resolution yields no problems. So, Arc is sort of right in saying this stems from the image itself just not being high enough resolution to zoom in as far as I am, but also shows this problem of how XP displays a blurrier image in a smoother format than the blocky/pixelated way Windows 7 does.

Does that make more sense?
My System SpecsSystem Spec
17 May 2010   #28
fseal

Windows 7 x64 Ultimate
 
 

Looking at the images, I would guess that the compression ratio is the same. The amount of artifacting looks exactly the same BUT it appears that the Windows 7 one has been "Sharpened". Look specifically at the bricks.

If you load the XP one into photoshop and sharpen it it will look like the 7 one.

There is definately a difference, but exactly whats causing it... dunno.
My System SpecsSystem Spec
17 May 2010   #29
mitchell65

Microsoft Windows 7 Home Premium 64-bit 7601 Multiprocessor Free Service Pack 1
 
 

I am loosing this thread I think. We started off with Windows 7 email photos being of lesser quality the XP. There does appear to be a very small difference and one can't help thinking "Does it really matter that much?" If you have an important image to send you would send it surely as an attachment at as higher quality as the recipient was able to receive!
We now seem to have gone into the hazy area of zooming. OK there seems to be a difference between XP and Win 7 but I for one can only see the difference when the two are put side by side! Not that many people have a dual boot system so again I ask "Does it really matter that much?"
My System SpecsSystem Spec
17 May 2010   #30
Arc

Microsoft Community Contributor Award Recipient

Microsoft Windows 10 Pro Insider Preview 64-bit
 
 

Quote   Quote: Originally Posted by mitchell65 View Post
I am loosing this thread I think. We started off with Windows 7 email photos being of lesser quality the XP. There does appear to be a very small difference and one can't help thinking "Does it really matter that much?" If you have an important image to send you would send it surely as an attachment at as higher quality as the recipient was able to receive!
We now seem to have gone into the hazy area of zooming. OK there seems to be a difference between XP and Win 7 but I for one can only see the difference when the two are put side by side! Not that many people have a dual boot system so again I ask "Does it really matter that much?"
Not at all ! It is absolutely true that the little difference is not traceable if the two are not placed side by side .
My System SpecsSystem Spec
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 jpg compression quality in windows 7 poorer than xp




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