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Grootte: 1382
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Grootte: 1746
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| Verwijderingen worden op deze manier gemarkeerd. | Toevoegingen worden op deze manier gemarkeerd. |
| Regel 5: | Regel 5: |
| Processing, converting, colour information is crucial for optimizing representation in PDF's or paper. Information can be used to change colours in CTB (Colour !TaBles) files for printing. | Processing and converting colour information is crucial for optimizing representation in PDF's or paper. Information can be used to change colours in CTB (Colour !TaBles) files for printing. |
| Regel 16: | Regel 16: |
| Regel 18: | Regel 17: |
| * However, 255,0,0 and 255,255,0 both results in hue is 0 values, some work to be done here... So: | |
| Regel 20: | Regel 19: |
| * CTB-files are compressed stuff and so far I am not able to properly write data to CTB. A link for uncompressing data can be found here: http://www.noliturbare.com/plot-print/print-ctbs-and-more * So far, no method is found to compress data back to CTB files. |
THIS IS A WORK IN PROGRESS!
BricsCAD and AutoCAD rely on 256 indexed colours. Lots of people like to work with black backgrounds, staring to white during a working day is less relaxed for the brains. So people draw yellow lines on the black screen and find out that they can't be seen when printed on white paper. Similar, very light blue on black is hardly visible on white.
Processing and converting colour information is crucial for optimizing representation in PDF's or paper. Information can be used to change colours in CTB (Colour TaBles) files for printing.
The subject is hard, wanted is an approach to optimize visibility. To limit complexity: RGB "Truecolor" is not discussed. And the tip of the day: Don't use these colours unless you understand the consequences.
More specific, we want a mapping of 256 (0-255) screen colours to 256 paper colours as a base for CTB files.
Inhoud
The table of index colours
There used to be a colorwheel drawing. Here it is: http://images.autodesk.com/adsk/files/colorwh.dwg.
A proper guide can be found here: http://www.niwa.nu/2013/05/math-behind-colorspace-conversions-rgb-hsl/
- However, 255,0,0 and 255,255,0 both results in hue is 0 values, some work to be done here... So:
The subject of Hue can be found here: https://en.wikipedia.org/wiki/Hue#Defining_hue_in_terms_of_RGB
CTB-files are compressed stuff and so far I am not able to properly write data to CTB. A link for uncompressing data can be found here: http://www.noliturbare.com/plot-print/print-ctbs-and-more
- So far, no method is found to compress data back to CTB files.
- It is pretty hard to obtain a list of RGB values of all indexed colours, so here it is: