Converting to 1-bit

Library of images to use as OFFIMG screens on the DM42
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BestofTimes
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Converting to 1-bit

Post by BestofTimes » Mon Dec 02, 2019 8:57 pm

What tools have you found useful to convert images to 1-bit bitmaps?

I've used Photoshop’s Diffusion Dither option to switch greyscale files to bitmaps but the results can sometimes be a bit hit and miss. What do you guys use?
HP-15C, HP-16C, HP-42s, HP-48GX. And now DM42!

toml_12953
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Re: Converting to 1-bit

Post by toml_12953 » Mon Dec 02, 2019 10:29 pm

BestofTimes wrote:
Mon Dec 02, 2019 8:57 pm
What tools have you found useful to convert images to 1-bit bitmaps?

I've used Photoshop’s Diffusion Dither option to switch greyscale files to bitmaps but the results can sometimes be a bit hit and miss. What do you guys use?
I use GIMP for Windows
Tom L

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tgray
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Re: Converting to 1-bit

Post by tgray » Tue Dec 03, 2019 12:07 am

Photoshop for initial cropping and then a python script I wrote for the mono conversion and final dithering.

I always loved the way Atkinson dithering looked. It reminds me of being a kid and playing on the classic Macs at my dad’s work. So I implemented it for myself when I got a DM42. Fun learning project.

My code is here for anybody who wants it:
https://github.com/tgray/hyperdither

Thomas Okken
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Re: Converting to 1-bit

Post by Thomas Okken » Tue Dec 03, 2019 5:37 am

I like the pgmtopbm tool from the Netpbm suite. The Netpbm suite is extremely old-school, it's a bunch of command-line tools, but well worth the time to familiarize yourself with.

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BestofTimes
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Re: Converting to 1-bit

Post by BestofTimes » Wed Dec 04, 2019 5:48 pm

I found the best results in an old copy of Paint Shop Pro at work using these settings.

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