I use GIMP working on digital images and I often need to crop images respecting the original ratio. Is there any easy way to do it? To perform this task I reduce the length for example, then I calculate how many pixels should be in height respecting the ratio with that length, then I crop again the height. This is rather boring so I am asking. Thanks in advance.

How about setting the 'Select rectangular regions' to the dimensions you want, mark out the section you wqnt and then crop selecting 'From selection' button. I use this procedure when cropping photos to the print size to fit the paper.

Norman

2007 m. geguž? 14 d., pirmadienis 17:04, Fabrizio Lippolis raš?:

Hi group,

I use GIMP working on digital images and I often need to crop images respecting the original ratio. Is there any easy way to do it? To perform this task I reduce the length for example, then I calculate how many pixels should be in height respecting the ratio with that length, then I crop again the height. This is rather boring so I am asking. Thanks in advance.

Fabrizio

Change canvas size. Picture>Canvas size.

Fabrizio Lippolis writes:

I use GIMP working on digital images and I often need to crop images respecting the original ratio. Is there any easy way to do it? To perform this task I reduce the length for example, then I calculate how many pixels should be in height respecting the ratio with that length, then I crop again the height. This is rather boring so I am asking. Thanks in advance.

The "Keep aspect ratio" toggle in the Crop tool's tool options is what you want.

Unfortunately, in 2.2 "Keep aspect ratio" is tricky to use: you turn it on, then drag in the image to crop and the checkbox turns off again! It only works if you check it on after you've started the crop, and by that time the crop rectangle is already the wrong aspect ratio.

Here's a workaround: click in the image. The crop dialog comes up. In the dialog, click "From Selection": this will set the crop rectangle to the whole image. Then go to the tool options and enable "Keep aspect ratio". Now you can adjust the upper left and lower right of the crop rectangle and it will maintain the image's aspect ratio.

This will all get a lot better in 2.4, with any luck. The crop tool has been completely redesigned and is much better than 2.2 already, though the aspect ratio part of it still needs some work.

Fabrizio Lippolis wrote:

Hi Norman,

How about setting the 'Select rectangular regions' to the dimensions you want, mark out the section you wqnt and then crop selecting 'From selection' button. I use this procedure when cropping photos to the print size to fit the paper.

I don't know if this exactly what I need, I am talking about ratio, not dimensions. I mean dimensions change, but ratio (the rate between length and height) is the same.

Which is preserved as long as you keep the tie between the height and the width. You can even specify whether you use inches, picas, pixels, or whatever.