You can take advantage of this by filling areas of your wallpaper with the same color, by applying a minor amount of blurring to soften edges, etc., but that will depend on the design of your wallpaper & how you want it to look.Īlso note that on Macs the System Preferences > Desktop & Screensaver offers several different ways to fill the screen with the wallpaper image, so it is not always necessary to match the screen size & image size exactly. Because of this, the DPI of the exported JPEG doesn't matter much. I got a new disk, moved the whole photo folder to the new disks, I deleted and import again in iPhoto the photos folder but now I CAN NOT. Click the Share button at the top of the Photos window and choose Set Desktop Picture. Click File > Share > Set Desktop Picture from the menu bar. If you have access to a Mac, compare for example the Zebras.jpg to the Pink Forest.jpg file in the /Library/Desktop Pictures folder - because the first has tons of fine detail while the second has very few of them, the second can be a much smaller file without significant loss of quality. Hello fellow mac members, I have over 40000 photos stored in iPhoto and I was using them with the 'Change desktop Background.' to change the desktop back every 15 minutes with a new photo. Right-click and choose Set Desktop Picture. So, the final file size of your wallpaper exported as a JPEG will depend on how many fine details it includes, as well as the export quality setting & its pixel dimensions. A consequence of this is that images that do not have a lot of fine detail to begin with can be compressed to smaller file sizes more than images that do, even at the same relatively high quality settings. The reason for this difference is JPEG uses lossy compression to reduce file size at the expense of reduced image quality. In this sense 'quality' means the amount of fine detail in the image - removing more of it results in greater compression & thus smaller file sizes. But even though they are all the same image size, they range in file size from over 26 MB down to a bit less than 3 MB. Apple includes several dozen high resolution wallpaper images in the /Library/Desktop Pictures folder at the 5120 x 2880 px image size. Wallpapers for Macs typically are JPEG files.
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