I have a problem with Darktable. I have an image which is 6000 x 3376 that I want to export in 4k: 3840 x 2160. I set these dimensions in the export tab and when I export I have a 3838 x 2160 image. Until then no problem my image has not the correct aspect ratio to be 3840 x 2160 so Darktable prioritized a correct height but incorrect width.
To solve the issue above I decided to crop the image with the 16:9 HDTV preset of the crop module. So now I expected that Darktable would be able to export to 4k: 3840 x 2160 which is 16:9. But surprisingly Darktable exports a 3840 x 2159 image which is very annoying. I am sure this is due to a rounding error.
I also have this same problem! I tried looking through the export module code to see if could find where this rounding was happening but didn’t find it (yet). I was thinking of trying to implement a “use exact dimensions” checkbox that would force the dimensions to be exactly as specified if indeed the current behavior is desirable in some cases
Hi! Happy to see I am not alone Yes it would be great to implement what you are proposing! I think I am going to open an issue on the Darktable Github.
I may be wrong but I have seen this issue with many sofwares when we specify a scaling of image to a desired size or format. Sometimes it appears the image just can’t be scaled correctly to that level/ratio and a pixel or two less for one parameter occurs. I presume this doesn’t cause a problem in the end use display if a single pixel is missing from one dimension, but maybe someone more knowledgeable can correct me if I am wrong about this.
Yes it would be great to implement what you are proposing! I think I am going to open an issue on the Darktable Github.