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I use the rectangle select to crop an image, but it has to be a fractional number. Let's say 1.6:1

Gimp version is 2.8.16 if I type fractional number GIMP rejecting and back to previous aspect ratio.

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    Does that dialog accept the equal ratio 16:10? – usr2564301 May 6 at 20:00
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    If you want to crop an image, the Crop tool is better, because it dims the part that will be cropped out so you see better what the result will be. In the standard case it is restricted to the canvas so you see better how you can extract a picture of the given aspect ratio from what you have. And if you tick "allow growing" you can generate a bigger picture that what you start with but still with the required aspect ratio (margins are added). – xenoid May 6 at 22:06
  • Thank you, both of you :) – Adi Prasetyo May 7 at 12:10
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More proper tools you should use is the crop tools, as suggested by xenoid on the question comment.

But in GIMP is still possible, with this trick:

you can multiply your desired aspect ratio with 10.

Let's say you want post-process a picture to social media with 1.91:1, you then set like so:

Using crop:

with crop tools

Using rectangle select:

x base 10

Alternatively, install Pix 2.4.5.

For basic photo editing such as rotate, flip, mirror and resize. But also have enhance focus and adjust contrast.

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