12-27-2021, 09:28 AM
(This post was last modified: 12-27-2021, 09:29 AM by rich2005.
Edit Reason: typo
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(12-26-2021, 09:36 PM)rimutaka Wrote: How to increase image size e.g. from 780x1040 to 1920x1080 pxl without reducing its quality?
Generally, no. Scaling up involves interpolating pixels which introduces some degree of degradation. There are exceptions, for example, pixel graphics scaled up with no interpolation.
I am sure someone will come along recommending XYZ.com that promises free super on-line results. However this is a Gimp forum for Gimp answers.
You can upscale your 780 x 1040 pix image but now we come to naming conventions width by height.
1920 x 1080 is 'landscape' while 780 x 1040 is 'portrait' (A) better if it is 1040 x 720 (B)
..and there is the question of aspect ratios, they are not the same. You can upscale to fit the height and introduce some vertical borders or upscape to the width and make an image with a greater height.
Whichever way you go it is Image -> Scale Image see: https://docs.gimp.org/2.10/en/gimp-image-scale.html
Then depending on the result sometimes a small amount of sharpening.