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first of all you have not specified what program you are using I am aware this is a photoshop forum but you do not specify that you are using it. Some programs if you rotate an image you are rotating the image but not the canvas which works fine for an image for example is 1000 pixels by 1000 pixels however if your image is 1500 X 1000 then when you rotate an image 90 degrees the original width of 1500 now has to fit on a canvas only 1000 pixels hence scales dow the picture. so Make sure you are rotating canvas as well not just the image