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STR #837
| Application: | FLTK Library |
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| Status: | 1 - Closed w/Resolution |
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| Priority: | 2 - Low, e.g. a documentation error or undocumented side-effect |
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| Scope: | 3 - Applies to all machines and operating systems |
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| Subsystem: | Core Library |
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| Summary: | fl_contrast gives poor results |
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| Version: | 1.1.6 |
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| Created By: | ajapted |
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| Assigned To: | mike |
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| Fix Version: | 1.1-current |
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| Update Notification: | |
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Trouble Report Files:
Trouble Report Comments:
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| #1 | ajapted
04:25 Apr 28, 2005 |
| I'm writing a small editor program with syntax
highlighting. I want comment text to be bright
blue on the black background, but fl_contrast()
forces it to white.
The test performed by fl_contrast (in 1.1.6) looks
pretty ad-hoc to me. It ignores the blue channel
completely, and the simple math ((A^B) & 0x80)
considers 0 and 127 as equal, but 127 and 128 as
a significant difference.
Hopefully this could be fixed ? | |
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| #2 | mike
10:08 May 12, 2005 |
| Fixed in Subversion repository.
Summary of fltk.bugs discussion: compute the luminosity and if the absolute difference is < 0.5, use the contrast color.
See attached patch... | |
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