I’ve recently started using Alamy for an avenue of image sales. One of their requirements is that the image must be over 48Mb uncompressed. At first I was a little confused as to what that means for the actual image size and the resulting dimensions that are required. After finding some info on the web with formulas, etc. I came up with this spreadsheet that allows you to easily figure out how big your new files has be to get the right size file. Simply enter in your original image dimensions, desired final uncompressed file size, and the resulting new image dimensions appear in the cells below. Try it out below.
This information is all I need to enter into many resizing software programs in order the get the right file size every time.
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