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Converting to 1-bit

Posted: Mon Dec 02, 2019 9:57 pm
by BestofTimes
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?

Re: Converting to 1-bit

Posted: Mon Dec 02, 2019 11:29 pm
by toml_12953
BestofTimes wrote:
Mon Dec 02, 2019 9:57 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

Re: Converting to 1-bit

Posted: Tue Dec 03, 2019 1:07 am
by tgray
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

Re: Converting to 1-bit

Posted: Tue Dec 03, 2019 6:37 am
by Thomas Okken
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.

Re: Converting to 1-bit

Posted: Wed Dec 04, 2019 6:48 pm
by BestofTimes
I found the best results in an old copy of Paint Shop Pro at work using these settings.

Image

Re: Converting to 1-bit

Posted: Sun Jan 05, 2020 8:57 am
by Jaymos
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.

Re: Converting to 1-bit

Posted: Fri Nov 06, 2020 9:51 pm
by reavy
tgray wrote:
Tue Dec 03, 2019 1:07 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
I found this thread while looking for tools to easily convert to 1-bit BMPs for my DM42. I had good luck with tgray's hyperdither. I forked it and made a small revision to get it to work with Python 3. Here for anyone who is interested: https://github.com/bpburns/hyperdither

Re: Converting to 1-bit

Posted: Wed Nov 11, 2020 10:50 am
by STS-741
I use Pierre-Emmanuel Gougelet's XnView (Ver. 2.49.4) software for this, which is available as freeware for several operating systems. It's easy to use and has been translated into 46 languages. The program is also freely available in a portable version. 8-)

Re: Converting to 1-bit

Posted: Fri Jan 22, 2021 6:13 pm
by revwillie
Just found that XnConvert (also from XnView) will take a 1 bit monochrome bitmap from GIMP and 'correct' it for viewing in my DM42.
I don't know what the new version of GIMP is doing wrong, but the files won't display unless I run them through XnConvert and re-save them.
I set up a 'clean metadata' action for the comments field which was never populated. Then the output file works fine in the DM42.