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Interpolation question

Sep 5, 2011, 23:23
Post: #1
Interpolation question
I've been trying to resize an image and tried Gimp 2's interpolation method but nothing happened. I increased the size to 150% with 153 pixels (I think). Did I do something wrong or is Gimp just not good for interpolation?
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Sep 6, 2011, 00:29
Post: #2
RE: Interpolation question
What did you use? "Image/Scale image"? With Sinc interpolation? What to you mean by "Nothing happened"? What kind of image is it? Photo? Computer graphics?

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Sep 6, 2011, 00:35
Post: #3
RE: Interpolation question
Yes I used Image/Scale Image, I changed the bottom boxes from 72.00 pixels to 100.00 pixels, hit scale....and nothing. The scale box closes and nothing happens (no status bar for interpolation and no changes to the picture). Really this is the only reason I downloaded Gimp, to increase pixels and allow me to enlarge images.

BTW - it was a computer graphic.
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Sep 6, 2011, 07:07
Post: #4
RE: Interpolation question
What you changed is the (only indicative) definition of the image. What really count is the size in pixels (upper boxes).

Computer graphics usually don't upscale well and may appear blocky/pixellated.

However, these small-scale original images are very often in a rather bad shape anyway (JPEG compression artifacts, loss of color/dithering for GIF...), but are often quite easy to redo from scratch, which gives you a much better image than the original. See for instance what can be done here (took me 20mns): http://gimpforums.com/thread-unpaid-need...ng-3d-text

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