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Dagen BrockandClaude Fable 5 a14a055084 Fix off-by-one scanline pairing in mono DHGR conversion

ConvertMono seeks to the stored row for image line 2y, but read the
second line of the pair sequentially — which in a bottom-up BMP is
the stored row above (image line 2y-1), not below; the pos -= packet
only updated the variable. Output line 0 averaged the top line with
a read past EOF, every other line averaged with the previous line
instead of the next, and the bottom source line was never read —
a half-line vertical phase shift in 560x384 color mono conversions.
Seek to the decremented pos so the pair is image lines 2y and 2y+1.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BCcEM6zYoVcXQt5YfvFo16

2026-07-23 18:12:39 -05:00

.github/workflows

cleanup bitrot

2026-07-21 18:51:53 -05:00

archival

initial commit

2020-05-03 09:55:45 -05:00

src

Fix off-by-one scanline pairing in mono DHGR conversion

2026-07-23 18:12:39 -05:00

tests

only uppercase new filename, not path

2020-06-09 06:55:16 -05:00

README.md

Multiplatform CICD

2020-05-31 19:53:38 -05:00

README.md

b2d

The b2d project provides modern builds of versions of bmp2dhr, a utility for converting modern graphics to Apple II graphics.

Releases

see the releases page

Usage

The b2d command will show a small amount of help upon execution without any arguments.

Here's an example of converting a BMP to a LoRes Apple II screen:

b2d myimage.bmp L N

The L is for LoRes output, and the N specifies to not include any header, just the raw image data.

About

b2d project is by Dagen Brock

Changelog

1.3 - Initial b2d project release
    - Add no header option
    - Bugfixes
    - Cross-platform fixes and CICD work for new builds