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Lossless cropping of a JPEG image is possible using the "jpegtran" application that comes with libjpeg; see https://en.wikipedia.org/wiki/Libjpeg. With other image-editing software you can minimize the loss by ensuring that the cropped area has dimensions that are multiples of 8 and is located with offsets being some multiple of 8 from the upper lefthand ...


If you are using Photoshop® then I don't believe that the image compresses when it crops. The compression happens when you resave the document as a JPG. It is always best to start with the highest lossless uncompressed image format you can such as .NEF, .BMP... others (?) As the saying goes, poop in poop out.

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