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This has been bugging me on Windows 7 as well, and much to my chagrin Microsoft didn't bother addressing that issue in Windows 8. Take this image for example:

1 (Click to open original unaltered image.)

It's made for retina Macbooks, so naturally it's being downscaled when setting it as wallpaper on my 1680x1050 screen. Windows 8 manages to make it look like shit, see this screenshot:

2

Is there any way of making Windows always use the original image, not some JPGized-to-hell version of it?

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FYI: Copying a pasting the link didn't work for me. Are you trying to set an image as you background that is smaller then 1680x1050 and have it cover the full screen? –  Sane Nov 17 '12 at 23:20
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What happens if you scale down the image manually to 1680x1050 and then set the resulting JPEG (or, even better, PNG) as a wallpaper? –  Claudius Nov 17 '12 at 23:27
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Original wallpaper shows up fine here. What wallpaper display options (Fill, Fit etc.) have you selected? –  Karan Nov 18 '12 at 3:36
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Why do you think Windows "jpg"-ify images? It can use png and gif without conversion. But it needs to scale it down to fit the screen if you select "Fit". You are bound to get artifacts with any scale down; if you want perfection, do the rescaling yourself because you can't expect Windows to read your mind or know what you personally think is perfection. –  Peon Nov 18 '12 at 4:37
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The "screenshot" looks perfectly fine to me, could you more clearly describe the problem? –  kreemoweet Nov 18 '12 at 5:31
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8 Answers

I had this problem myself, searched endlessly for an answer and found none. Until I found someone who did not have this problem, I asked them to share their wallpaper with me and I tried it, sure enough, their wallpaper did not have any on screen artifacts and the resulting compressed wallpaper, was not a shrunken down jpg. In fact, the file size of the "compressed" jpg was larger than the original.

So I decided to look around into the settings on the jpg, nothing unusual that I could see, the image was 1900x1200 at 72.009dpi and 8bit. I decided to scale down my own personal wallpapers to the 1900x1200 size, changed the dpi and bitrate to match the other jpg. After saving my new image, I right clicked on it and chose set to desktop, the resulting image has no artifacts and is no longer compressed. This works for every wallpaper I have.

If you try this, I think you need to make sure you change the image dimensions to match that of what your screen resolution is exactly. Also making sure the dpi is set to 72.009 and 8bit. Try it out, see if this helps anyone. I will be posting this message on all the forums and blogs I see discussing this.

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Resizing the image to the resolution of display produced a perfect result for me. Without knowing my monitor DPI, I exported the JPG as 300 DPI, quality: 100. I manage my images in Lightroom, so I cropped the image to match the aspect ratio of my monitor. Then in LR, exported with: 300 DPI, Resize to fit: <monitor res>, allow enlarge, JPG, quality 100, Sharpen for screen. –  Alastair McCormack Apr 30 '13 at 15:53
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In Windows 7, opening the image using internet explorer, then right-click: 'set as background image', used to do the trick.

This seems to do the same thing (unconfirmed) as manually setting the registry value.

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Thanks, but the registry value already points to the real image, not the "TranscodedWallpaper" one, which seems weird. Thanks, Microsoft. –  Peter W. Nov 18 '12 at 22:07
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NO. I can confirm this behaviour on Windows 7 64 bit. It occurs for all image types (PNG and BMP) included whenever the user right clicks a thumbnail and chooses "Set as background". I doubt many people notice the behavior because they are not using technical or well drawn backgrounds.

The workaround that worked for me was to open the image (any format) in IrfanView and use that program's "set as wallpaper" feature. It's in the menu under "Options."

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I removed the part of the rant, which does not add to the answer. As well, the OP is asking about Windows 8; mentioning Windows 7 does not answer the question, and may make this answer un-useful by itself –  Canadian Luke Mar 15 at 20:15
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Don't set the wallpaper in Windows 8 using Windows Photo Viewer. Windows Photo Viewer saves a lower quality jpeg and uses that as the wallpaper. Use the Control Panel\Appearance and Personalization\Personalization or just right click and select "Set as desktop background".

Also, since you're down-scaling an image you might want to edit/resize it using photoshop to the native resolution of your monitor. Windows is known to produce low quality (ie. rough) downscaling of images and produces the occasional artifacts on wallpapers.

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It's simple guys, you have to save it as .png24 and windows wont change the quality. Never use .jpg for Windows 7, 8, 8.1 wallpapers if you look for quality.

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Nope, Windows will just convert it to a shitty JPG. I'm using an up-to-date Windows 8.1 and this is still happening. –  Peter W. Oct 29 '13 at 23:32
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I'm using Windows 7 and I had the same problem as you. In Windows 7, opening the png image on FastStone Image Viewer and setting it as the wallpaper there worked for me. The quality was maintained and it was really saved as png. I don't know with if it'll work with Windows 8.

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  1. open it in MS Paint
  2. select all (the entire image) and copy it
  3. make a new file and paste the image
  4. save it as BMP
  5. now find that BMP file and rename it to JPG
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This just isn't practical. I might as well fill my hard drive with random bytes until it's full. –  Peter W. Feb 16 '13 at 18:38
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Use PNG! I had this same problem but the use of ms Paint and png file format has helped me.

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Can you please clarify what procedure the OP should use (i.e., provide instructions)? –  Scott Jun 24 '13 at 17:57
    
This isn't helpful at all since Windows JPGizes everything that isn't JPG (looks like shit) or BMP (too frickin' large). That includes PNG files. –  Peter W. Jun 24 '13 at 18:05
    
Open the image in Paint and save it as a PNG. Right-mouse click on the image and select "Set desktop image" (for left-handed - the left mouse button :)). –  Андрей Jun 24 '13 at 18:17
    
This is all what I have. When the hard drive of 500GB is not worth worrying about the size of images, audio files or other small items. –  Андрей Jun 24 '13 at 18:29
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