![java jxl colour custom color java jxl colour custom color](https://i.stack.imgur.com/xzgcA.gif)
The following code changes the colors used on a text field.
![java jxl colour custom color java jxl colour custom color](https://www.viralpatel.net/app/uploads/2012/11/excel-file.png)
Using colorĪs stated earlier, colors can be applied to border, fill or text. The second input is the name of the color space it will be converted into. The first input to the function is the color that will be converted. Again, the color object comes to the rescue with a function, the nvert() function. Sometimes it is important to convert color values into a particular color space. In the code above the first input is RGB and the second input is CMYK, but the function returns true, since they are both blue. It automatically converts the colors to the same color space. The equal() function takes two inputs, which are the colors that will be compared. Fortunately, the color object provides a function for comparing colors, the color.equal() function. Since there are three color spaces and the color values are arrays, there is no simple method for determining if two colors are equal.
![java jxl colour custom color java jxl colour custom color](http://4.bp.blogspot.com/-vb4bPOuR8Uk/TqhRLsffr6I/AAAAAAAAAaU/B6f5dLi1Psw/s1600/GradientPalette.png)
Unfortunately, only the simple colors are predefined, as shown in Table 1.Īdding your own predefined colors to the color object is simple, as shown below. To help simplify specifying and using colors, Acrobat JavaScript provides a color object with some predefined colors and color operators. var jsColorChannel = eightBitColorChannel / 255 Use the following code if you need to convert an 8 bit color depth to a JavaScript color. This range allows the color value to be easily specified in hexadecimal, where each channel has a color resolution of 8 bits (1 byte). Converting from other color specificationsĬolor specifications in most other environments, such as HTML, use an integer value between 0 and 255 for the color channel value.
#JAVA JXL COLOUR CUSTOM COLOR FULL#
So to make the color specification as generic as possible, values are specified as a floating-point number between 0 and 1, where a 0 value means no color on that channel, and 1 means full color. JavaScript must be cross-platform and able to deal with a variety of display hardware. The following code specifies colors in each of the different color spaces. The color spaces are RGB (3 channels- Red, Green, and Blue), CMYK (4 channels- Cyan, Magenta, Yellow, and Black), gray scale (1 channel), and transparent (no channels). The elements of the color array are the color space name followed by a numerical value for each color channel in the color space. The array provides some flexibility, but does not go overboard. Colors are stored as an array of simple values. But JavaScript, of course, needs to be as simple as possible, so the Acrobat JavaScript model uses a compromise solution. In fact, inside the PDF, color specifications can be very complex. Color is a slightly complex topic and many methods have been developed for specifying color. In Acrobat JavaScript, color is primarily used for setting annotation and form field visual properties, such as the border, fill, and text.