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Windows degrades Desktop Background images

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  1. #1



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    Windows degrades Desktop Background images


    Screenshot 1 is an image I use on my desktop. It has not been resized or touched up in any way. I loaded into Photoshop, cropped, then saved as .jpg.

    Screenshot 2 is taken using the Snipping Tool on the desktop and you can see artifacts in it. This is exactly how it looks on my Windows 8 1680x1050 desktop, so further compression as you may think is not to blame.

    The point is, Windows degrades images when it puts it on the desktop. That shouldn't be imho.
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  2. #2
    fafhrd's Avatar

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    The images are now of different sizes. I would guess that the artefacts come from the resizing down of the original image. Windows tries to put approximately 1.1 linear pixels (1.21 rectangular pixels) into each pixel of the resized image.

    JPG are a lossy format anyway, and even the original shows artefacts at magnifications of more than 200%, with blue color bleed into the white and rectilinear artefacts in the color highlights on the flag.

    Windows metafiles (WMF) are vector graphics, I believe - but I doubt you will be able to use them in place of jpg or png on the desktop.

    PS Image rendering at zoom levels varies between browsers - fuzzy in IE8, worst artifacts in Chrome 19.0.1, fairly good in Opera 11.61 and Firefox 11.0 the best overall. IE8 (overlapping) and Opera (side by side) fail to preserve layout of the 2 images.
    Last edited by fafhrd; 31 Mar 2012 at 05:42 AM.
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    Yeah, original file is 1920x1200 and my desktop is 1680x1050.

    Thanks for the info!

    Maybe if I resize images myself to my desktop size, then use them, it might alleviate some or all of the seen artifacts.
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    I cannot say - try it and let us share in your experience!

    cheers
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  5. #5



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    No real improvement I think. This is resized to 1680x1050 (the whole wallpaper I mean) and then saved as .jpg on max 12 and set as desktop background.

    Seems to be the same:

    Name:  Capture.JPG
Views: 4888
Size:  14.3 KB
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  6. #6



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    my main issue is that window backgrounds are instantly converted into jpg once u set a wallpaper. so lets say you set a nice png as a background, this will in turn look horrible as a wallpaper since its now a jpg. I really hate this...
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  7. #7
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    I also noticed that, setting as background on .png HQ wallpaper, but when its on desktop it looks horrible.
    why o why ?
    does using 3rd party apps to set it as wallpaper, same results?

    EDIT:

    Okay, i did some experiment.

    Built-in-windows:
    I tried to right-click a .PNG HQ 1920x1080 Image then Set as Desktop Background = degradation of image on desktop noticeable
    I also tried to resize it in CS5 to 1366x768, output as .PNG, then set that as wallpaper via right-click, degradation noticeable

    3rd party app:
    I tried to open the same .PNG HQ 1920x1080 image in IrfanView > Ctrl+R (resize) change it to my local desktop screen resolution (1366x768), save as .PNG then open the resized image on IrfanView > Ctrl+Shift+C = Awesome HQ Wallpaper (No Degradation of quality pixels noticeable)...

    Test machine Windows 7 Pro SP1 x64 (havent tested on Windows 8, due to I removed it yesterday)

    Here's the HD Wallpaper Id used (1920x1080);

    Click image for larger version
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    Nope, tried that in windows 8 and still the same results, it still converts the image to jpg and sets it as a wallpaper, its the same as setting it from another app like firefox. There pretty much is no way around it, although for my test wallpapers there was no need to resize
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  9. #9
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    Is it to do with colour depth? 8bit can look crap compared to 16bit colour, but generally as poor gradation rather than jpeg type artifacts. Your image though looks the victim of bad scaling somewhere along the line.
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  10. #10
    fafhrd's Avatar

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    Wallpaper size standard is 1920 x 1200, with color depth of true color, 24-bit - It's the same on my netbook with resolution of 1024x600 or my desktop with a resolution of 1440x900
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