Fade through more more natural rainbow spectrum in HSV/HSB?

I'm trying to control some RGB LEDs and fade from red to violet. I'm using an HSV to RGB conversion so that I can ju...

Shift hue of an RGB Color?

I'm trying to write a function to shift the hue of an RGB color. Specifically I'm using it in an iOS app, but the ma...

Why if i extract image jpg from pdf with wand, it turn me a black background over the text?

I have a problem with some pdf files. I need to convert them into jpg images making them available for the OCR, but ...

How can I generate a rainbow circle using HTML5 canvas??

I would like to generate a canvas image using gradients in some clever way. I would like the image to looks somethin...

Finding the (x,y) indexes of specific (R,G,B) color values from images stored in NumPy ndarrays?

I have an image stored in a numpy array, as yielded by imread(): >>> ndim array([[[ 0, 0, 0], ...

libpng warning: iCCP: known incorrect sRGB profile?

I'm trying to load a PNG image using SDL but the program doesn't work and this error appears in the console libp...