Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
I have a colour with rgb values 17, 30, 62.
I did linear gradient fill of a rect with this colour.
On mouse over of rect i want to change the colour value in a text box.
Is there any function or ratio to increase and decrease RGB values programatically
Then i can get the colour back with Raphael.rgb
Raphael cannot help you get the color at a specified pixel, as it only deals with vector graphics (SVG/VML). The rendering is done by the browser.
In the color picker example, the color is obtained from the coordinates in the circle — the picker knows beforehand, which color it would find in a specified point. It does not check the color of the pixel under the cursor.
If you have a linear gradient with known edge colors it is a matter of linear interpolation to figure out the color of the gradient in any point (unless there is some transparency involved). Find the distance from the two anchor points of the gradient, estimate the relative distance to each and combine the colors using these coefficients.