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Why do my images look pixelated?

My guess is the problem is with the resizing algorithm. It needs more antialiasing or more DPI or something. Is there any way I can improve that?

org-mode: enter image description here

Original: enter image description here

Here is the complete text of the org-mode file, though this happens with all images in every file (and so this info doesn't really matter):

#+TITLE: bootstrap * [[https://en.wikipedia.org/wiki/Bootstrapping_(statistics)][Bootstrapping (statistics) - Wikipedia]] * [[https://en.wikipedia.org/wiki/Bootstrap_aggregating][Bootstrap aggregating - Wikipedia]] #+ATTR_HTML: :width 629 [[file:gen.org_imgs/20240111_105923_TIIbBt.jpg]] ** ML Dr. Jafari #+ATTR_HTML: :width 900 [[file:gen.org_imgs/20240111_035644_BCth5p.jpg]]
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    That looks fine to me. Can you be more specific about the problem? Commented Jan 11, 2024 at 8:16
  • @db48x The boundaries of the different colors are blurred Commented Jan 11, 2024 at 10:10
  • If you say so. I can’t see anything wrong. Why don’t you take a screenshot of just the problem, and nothing else. Maybe even zoom in on it. Commented Jan 11, 2024 at 10:47
  • Or maybe even better, provide the Org mode file itself and any instructions necessary to reproduce the problem, so that we can try it out and see for ourselves. Commented Jan 11, 2024 at 21:32
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    Here's a screenshot: i.sstatic.net/Sqs4o.png - the top is the image opened in Emacs, the bottom is the same image displayed by ImageMagick. I don't see any difference. [BTW, I don't know what happened, but the links to files.lilf.ir work.] Try using medianfo to examine image metadata in the file. You cannot increase the resolution of a raster image (like a JPG): your best bet is to start from a vector image (like an SVG) and convert it to a raster image at the dimensions you are interested in and then leave it alone: no more conversions or resizing. Commented Jan 15, 2024 at 19:18

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