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The customer agreed to provide the suspect image to the product team for closer investigation. The file size was only 48KB, so the 20MB limit was not the issue. The next step in the investigation was to ask the JPEG decoder team to study the image file and determine why it was being rejected by Windows.
Perhaps the image was subtly corrupted or slightly out of specification? Perhaps it used a JPEG feature the Windows JPEG decoder doesn’t support? Perhaps there was simply a bug in the Windows JPEG decoder itself that this particular image was tripping overAs it happens, the shell team didn’t need to call in the JPEG decoder team after all. The answer was plain to see once you had the image file. It was something the attentive reader may have noticed when the customer said they had an 8-bit JPEG. There’s no such thing as an 8-bit JPEG image. JPEG images are always 24-bit imagesWhat the customer had was not actually a JPEG image at all. It was a GIF file that had been renamed with the JPEG extension (GIF, short for Graphics Interchange Format, is another type of bitmap image format). That’s why the Windows JPEG decoder rejected it. It wasn’t a JPEG at allAt this point, the guidance for the customer was simple. They needed to take the GIF file and convert it to either BMP or the real JPEG format. Those are the two image formats that Windows 7 supports for wallpapers. When they converted the file, they had to remember to give it the correct file extensionSo, when you’re having trouble with a JPEG image, it helps to verify that what you have really is a JPEG image in the first place

Window 7 Wallpaper Hd