|
Grootte: 908
Commentaar:
|
Grootte: 1574
Commentaar:
|
| Verwijderingen worden op deze manier gemarkeerd. | Toevoegingen worden op deze manier gemarkeerd. |
| Regel 1: | Regel 1: |
| '''THIS IS A WORK IN PROGRESS!''' | |
| Regel 2: | Regel 3: |
| BricsCAD and AutoCAD rely on 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. | 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. |
| Regel 4: | Regel 5: |
| Processing, converting, colour information is crucial for optimizing representation in PDF's or paper. Information can be used to change Colour TaBles in CTB files for printing. | 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. |
| Regel 6: | Regel 7: |
| The subject is hard, wanted is an approach to optimize visibility. To limit complexity: RGB "Truecolor" is not discussed. | 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. |
| Regel 12: | Regel 15: |
| There used to be a colorwheel drawing. Here it is: http://images.autodesk.com/adsk/files/colorwh.dwg. It is pretty hard to obtain a list of RGB values of all indexed colours, so here it is: |
* 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/ * 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 * It is pretty hard to obtain a list of RGB values of all indexed colours, so here it is: |
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, 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/
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
- It is pretty hard to obtain a list of RGB values of all indexed colours, so here it is: