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MacPaint Art from the Mid-80s Still Looks Great Today

(blog.decryption.net.au)
1033 points decryption | 3 comments | 12 Jul 25 08:45 UTC | HN request time: 0.649s | source
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perihelions ◴[12 Jul 25 09:57 UTC] No.44540767[source]▶
I think the .png images on this website are larger than the uncompressed originals (1-bit depth, 1 bit per pixel).
replies(1): >>44540779 #
1. decryption ◴[12 Jul 25 10:01 UTC] No.44540779[source]▶
Yep, I upscaled them by 400% so they’re easier to view on modern displays.
replies(1): >>44540829 #
2. perihelions ◴[12 Jul 25 10:07 UTC] No.44540829[source]▶
I know; I mean to say they're larger file sizes—the PNG compression ratio is effectively less than one.

Take the first one, "acius.png", at 84,326 bytes. If you losslessly scale back to the original size (1/4th) and convert to 1-bit NetPBM, it's 51,851 bytes, without compression. I thought that was remarkable.

replies(1): >>44541134 #
3. encom ◴[12 Jul 25 11:05 UTC] No.44541134[source]▶
The PNG files seem to be very poorly compressed.

  $ oxipng -o max --strip all -avZ --fast acius.png
  Processing: acius.png
      2304x2880 pixels, PNG format
      8-bit Indexed (2 colors), non-interlaced
      IDAT size = 84251 bytes
      File size = 84326 bytes
  Transformed image to 1-bit Indexed (2 colors), non-interlaced
  Trying filter None with zopfli, zi = 15
  Found better result:
      zopfli, zi = 15, f = None
      IDAT size = 24466 bytes (59785 bytes decrease)
      file size = 24541 bytes (59785 bytes = 70.90% decrease)
  24541 bytes (70.90% smaller): acius.png