pdf:colors
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pdf:colors [2015/03/28 13:40] – created dokuadmin | pdf:colors [2016/05/12 12:37] (current) – [Special colorspaces] christian | ||
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+ | ====== Colours in PDF ====== | ||
+ | |||
PDF distinguishes between filling (paint the interior of a closed path) and stroking (paint the outline of a path) when painting. Each mode has its own color and is used with the appropriate paint operators. | PDF distinguishes between filling (paint the interior of a closed path) and stroking (paint the outline of a path) when painting. Each mode has its own color and is used with the appropriate paint operators. | ||
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In order to set a color, first the colorspace and then the actual color has to be set with the right parameters for that colorspace. For example setting the stroking color to red in RGB: | In order to set a color, first the colorspace and then the actual color has to be set with the right parameters for that colorspace. For example setting the stroking color to red in RGB: | ||
- | /DeviceRGB CS % set colorspace for stroking | + | |
- | 1 0 0 SC % set stroking color | + | 1 0 0 SC % set stroking color |
For the device colorspaces, | For the device colorspaces, | ||
- | 1 0 0 RG % set RGB colorspace and color for stroking | + | |
There are 11 distinct colorspaces available in PDF: | There are 11 distinct colorspaces available in PDF: | ||
- | ### Device colorspaces | + | ===== Device colorspaces |
Device dependent, Not reproducable. | Device dependent, Not reproducable. | ||
- | * **DeviceGray** 1 components [0..1]; `0` is black, `1` is white. | + | |
+ | * **DeviceRGB** additive (for screens); 3 components [0..1]; `0 0 0` is black, `1 1 1` is white. | ||
+ | * **DeviceCMYK** subtractive (for printing); 4 components [0..1]; `0 0 0 1` is black, `0 0 0 0` is white. | ||
- | * **DeviceRGB** additive (for screens); 3 components [0..1]; `0 0 0` is black, `1 1 1` is white. | + | ===== CIE-based colorspaces ===== |
- | * **DeviceCMYK** subtractive (for printing); 4 components [0..1]; `0 0 0 1` is black, `0 0 0 0` is white. | ||
- | |||
- | ### CIE-based colorspaces | ||
Calibrated: device independent, | Calibrated: device independent, | ||
- | * **CalGray** | + | |
+ | * **CalRGB** | ||
+ | * **Lab** | ||
+ | * **ICCBased** | ||
- | * **CalRGB** | + | ===== Special colorspaces ===== |
- | * **Lab** | + | |
+ | * **Pattern** | ||
+ | * **Separation** | ||
+ | * **DeviceN** | ||
- | * **ICCBased** | + | Most commonly used and easiest are the device colorspaces. Setting black is done like this in the different colorspaces: |
+ | % DeviceGray | ||
+ | 0 G % stroking | ||
+ | 0 g % filling | ||
+ | % DeviceRGB | ||
+ | 0 0 0 RG % stroking | ||
+ | 0 0 0 rg % filling | ||
+ | % DeviceCMYK | ||
+ | 0 0 0 1 K % stroking | ||
+ | 0 0 0 1 k % filling | ||
- | ### Special colorspaces | + | The renderer supports |
- | + | ||
- | * **Indexed** | + | |
- | + | ||
- | * **Pattern** | + | |
- | + | ||
- | * **Separation** | + | |
- | + | ||
- | * **DeviceN** | + | |
- | + | ||
- | Most commonly used and easiest are the device | + | |
- | % DeviceGray | + | |
- | 0 G % stroking | + | |
- | 0 g % filling | + | |
- | % DeviceRGB | + | |
- | 0 0 0 RG % stroking | + | |
- | 0 0 0 rg % filling | + | |
- | % DeviceCMYK | + | |
- | 0 0 0 1 K % stroking | + | |
- | 0 0 0 1 k % filling | + | |
- | The PDF4Smalltalk library supports these variations by initializing the renderer | + | <code smalltalk> |
+ | renderer | ||
+ | renderer | ||
+ | </ | ||
- | " | + | The renderer |
- | renderer | + | |
- | renderer fillColor: < | + | |
- | " | + | |
- | renderer strokeColor: | + | |
- | renderer fillColor: < | + | |
- | " | + | |
- | renderer strokeColor: | + | |
- | renderer fillColor: < | + | |
Example: | Example: | ||
- | page := Page newInBounds: | + | <code smalltalk> |
- | renderer fillColor: ColorValue red. | + | page := Page newInBounds: |
- | renderer addRectangleLeft: | + | renderer fillColor: ColorValue red. |
- | renderer fill. | + | renderer addRectangleLeft: |
- | renderer strokeColor: | + | renderer fill. |
- | renderer linewidth: 5. | + | renderer strokeColor: |
- | renderer addRectangleLeft: | + | renderer linewidth: 5. |
- | renderer stroke]. | + | renderer addRectangleLeft: |
+ | renderer stroke]. | ||
+ | </ |
/var/www/virtual/code4hl/html/dokuwiki/data/pages/pdf/colors.txt · Last modified: 2016/05/12 12:37 by christian