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+--- Thread: Shrink Image without Loss of Quality (/Thread-Shrink-Image-without-Loss-of-Quality)
Shrink Image without Loss of Quality - messyj232 - 07-17-2018
Hi everyone! I have a pretty big image (it's a logo) and its dimensions are 6900x2500. I am trying to shrink it down to a width of about 500 but it always comes out pixelated. Is there anyway to shrink this image without losing quality? Thank you very much!
RE: Shrink Image without Loss of Quality - Ofnuts - 07-17-2018
This is due to spatial frequency folding. The cure is to blur the image before you scale down, to remove the details that would be frequency-folded but wouldn't be visible in the scaled-down image anyway. Blur how much, you will ask... by the scaling ratio: 6900/500 in your case. You don't even need to compute this on the side, open Filter>Blur>Gaussian blue and enter 6900/500 in the Blur radius fields (should yield 13.8).
Unblurred:
[attachment=1935]
Blurred:
[attachment=1936]
This said, this logo likely exists as a vector image (.ai, .svg) and scaling it as a vector image (Inkscape, Illustrator) would yield perfect results.
RE: Shrink Image without Loss of Quality - rich2005 - 07-17-2018
Yeah, as a SVG. Partly redrawn, partly converted from the bitmap. If I could find the fonts easily, I would have replaced the text as well.
The horizontal white stripes suffer when downscaling so made them a little wider and moved a little.
Open an svg in Gimp like this:
![[Image: 72PT9d7.jpg]](https://i.imgur.com/72PT9d7.jpg)
and I would keep the depth to 200 pix if possible. Smaller and you will have to repaint those white lines.
[attachment=1940]
RE: Shrink Image without Loss of Quality - messyj232 - 07-17-2018
Ofnuts, thank you very much!!!
Rich 2005, thank you! Great response, I really appreciate it. Especially because I couldn't find anything online or in the forums!