Converting to 1-bit

Library of images to use as OFFIMG screens on the DM41X and DM42
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Images MUST be in Windows-NT .bmp format at a resolution of 400x240 pixels and 1-bit colour depth or they will not be displayed by the DM42. Images that do not meet this requirement will be removed from the forum :)
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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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Jaymos
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Re: Converting to 1-bit

Post by Jaymos » Sun Jan 05, 2020 7:57 am

I have a long list of image processing software available on both Mac and Win, but I prefer and use the free IrfanView + free add-on pack for this. On Mac, Winebottler is needed to make an app, and the app works well including cut and paste. In my opinion it’s my Swiss army knife equivalent for many many years already.
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