If you want to crop an image in Photoshop while keeping a certain aspect ratio, you can do that by filling in the ratio as a dimension (in cm or inch) in the Crop Tool, and leave out the resolution. The only disadvantage is that Photoshop will update the resolution, so that your image will become 2 x 3 cm at a strange resolution of 2145.4 pixels per inch or something like that. Of course you can correct this in the ‘Image Size’ dialog (set the resolution to what you need and uncheck ‘Resample Image’), but that means another step. An alternative is to use the Rectangular Selection tool. This tool can be set to a ratio. Select what you want to crop, then choose menu ‘Image > Crop’.

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