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paulrickardsThis animation shows the simulated output of CUPS ImageWriter II DitherPPI setting approximately from 2 to 31. After that, it changes to a more posterized dither and is the same for any larger value. You can see the dithering dots start very large and shrink down with each new value.<a href="https://mastodon.social/tags/RetroComputing" class="mention hashtag" rel="nofollow noopener" target="_blank">#RetroComputing</a> <a href="https://mastodon.social/tags/VintageApple" class="mention hashtag" rel="nofollow noopener" target="_blank">#VintageApple</a> <a href="https://mastodon.social/tags/VintageMac" class="mention hashtag" rel="nofollow noopener" target="_blank">#VintageMac</a> <a href="https://mastodon.social/tags/ImageWriterII" class="mention hashtag" rel="nofollow noopener" target="_blank">#ImageWriterII</a>

paulrickardsI was able to tweak the output of the ImageWriter II prints from CUPS to be slightly better. I've updated the blog post.<a href="https://biosrhythm.com/?p=2791" rel="nofollow noopener" translate="no" target="_blank">https://biosrhythm.com/?p=2791</a><a href="https://mastodon.social/tags/RetroComputing" class="mention hashtag" rel="nofollow noopener" target="_blank">#RetroComputing</a> <a href="https://mastodon.social/tags/VintageApple" class="mention hashtag" rel="nofollow noopener" target="_blank">#VintageApple</a> <a href="https://mastodon.social/tags/VintageMac" class="mention hashtag" rel="nofollow noopener" target="_blank">#VintageMac</a> <a href="https://mastodon.social/tags/ImageWriterII" class="mention hashtag" rel="nofollow noopener" target="_blank">#ImageWriterII</a>

paulrickardsOk, so this centipede printer workflow isn’t really reliable so I dove into CUPS to try and see if there’s a way to alter the dithering. I tried adding different settings to the PPD file but nothing produced any changes.Until I added “DitherPPI” (a GS option) and it produced a result that was pretty good! I tried various values (30, 80, 120, 180) but they all looked identical. In any case, this is good enough for me!<a href="https://mastodon.social/tags/ImageWriterii" class="mention hashtag" rel="nofollow noopener" target="_blank">#ImageWriterii</a> <a href="https://mastodon.social/tags/RetroComputing" class="mention hashtag" rel="nofollow noopener" target="_blank">#RetroComputing</a> <a href="https://mastodon.social/tags/VintageApple" class="mention hashtag" rel="nofollow noopener" target="_blank">#VintageApple</a> <a href="https://mastodon.social/tags/VintageMac" class="mention hashtag" rel="nofollow noopener" target="_blank">#VintageMac</a> <a href="https://mastodon.social/tags/netatalk" class="mention hashtag" rel="nofollow noopener" target="_blank">#netatalk</a>

paulrickardsThe way it works is this:1. A print is initiated from a device to the CUPS-PDF driver on my <a href="https://mastodon.social/tags/netatalk" class="mention hashtag" rel="nofollow noopener" target="_blank">#netatalk</a> Raspberry Pi. 2. The resulting PDF is placed in the AFP share of netatalk/afpd. 3. An emulated PPC Mac 9.2.2 running the <a href="https://mastodon.social/tags/AppleScript" class="mention hashtag" rel="nofollow noopener" target="_blank">#AppleScript</a> below is watching for new files in that folder and will print them using Acrobat Reader to the <a href="https://mastodon.social/tags/ImageWriterII" class="mention hashtag" rel="nofollow noopener" target="_blank">#ImageWriterII</a> via <a href="https://mastodon.social/tags/LocalTalk" class="mention hashtag" rel="nofollow noopener" target="_blank">#LocalTalk</a> using the MacPalette II driver.It works, but crashes with dialog that I can't auto-dismiss.<a href="https://mastodon.social/tags/RetroComputing" class="mention hashtag" rel="nofollow noopener" target="_blank">#RetroComputing</a> <a href="https://mastodon.social/tags/VintageApple" class="mention hashtag" rel="nofollow noopener" target="_blank">#VintageApple</a> <a href="https://mastodon.social/tags/VintageMac" class="mention hashtag" rel="nofollow noopener" target="_blank">#VintageMac</a>

paulrickardsI lifted some halftone settings and stuffed them into the ImageWriter II foomatic PPD and did some test strip prints.At both resolutions, the result seems to be the same? So maybe that’s not the setting I need. Maybe it can’t be changed? MacPalette II still wins here!<a href="https://mastodon.social/tags/RetroComputing" class="mention hashtag" rel="nofollow noopener" target="_blank">#RetroComputing</a> <a href="https://mastodon.social/tags/VintageApple" class="mention hashtag" rel="nofollow noopener" target="_blank">#VintageApple</a> <a href="https://mastodon.social/tags/VintageMac" class="mention hashtag" rel="nofollow noopener" target="_blank">#VintageMac</a> <a href="https://mastodon.social/tags/ImageWriterII" class="mention hashtag" rel="nofollow noopener" target="_blank">#ImageWriterII</a>

paulrickardsIn the interest of science, I did an ImageWriter II comparison print of CUPS vs the MacPalette driver for Classic. I think MacPalette wins here. There appears to be better color range and the text is a little sharper. <a href="https://mastodon.social/tags/RetroComputing" class="mention hashtag" rel="nofollow noopener" target="_blank">#RetroComputing</a> <a href="https://mastodon.social/tags/VintageApple" class="mention hashtag" rel="nofollow noopener" target="_blank">#VintageApple</a> <a href="https://mastodon.social/tags/VintageMac" class="mention hashtag" rel="nofollow noopener" target="_blank">#VintageMac</a> <a href="https://mastodon.social/tags/LiveLaughLocalTalk" class="mention hashtag" rel="nofollow noopener" target="_blank">#LiveLaughLocalTalk</a> <a href="https://mastodon.social/tags/ImageWriterII" class="mention hashtag" rel="nofollow noopener" target="_blank">#ImageWriterII</a>

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