In direct answer to your question, the y axis is given first in numpy arrays, followed by the x axis, so interchange your indices. Less directly, you will find that for loops are very slow in Python and you are generally better off using numpy vectorised operations instead. Also, you will often find it easier … Read more
This is for the the HSV values in the range [0,1] (and giving RGB values in the range [0,1], instead of {0, 1, …, 255}: function HSVtoRGB(array $hsv) { list($H,$S,$V) = $hsv; //1 $H *= 6; //2 $I = floor($H); $F = $H – $I; //3 $M = $V * (1 – $S); $N = … Read more
I don’t know of any C# API or library that can achieve this. However, if you have enough C/C++ knowledge to build a wrapper for C#, I see two options: Windows Color System (WCS) (part of Windows) LittleCMS The System.Windows.Media namespace is very limited. There’s probably a powerful engine (WCS?) behind it, but just a … Read more
There is some information in the Web Content Accessibility Guidelines (WCAG) 2.0 (http://www.w3.org/TR/2008/REC-WCAG20-20081211) Visual contrast: http://www.w3.org/TR/2008/REC-WCAG20-20081211/#visual-audio-contrast-contrast Contrast ratio: http://www.w3.org/TR/2008/REC-WCAG20-20081211/#contrast-ratiodef Relative luminance : http://www.w3.org/TR/2008/REC-WCAG20-20081211/#relativeluminancedef There’s a good example in this site but he calculate where two colors are enough, not how to get them. To choose a color with good contrast, I’d go with complementary colors: … Read more
Convert the RGB values to the range 0-1, this can be done by dividing the value by 255 for 8-bit color depth (r,g,b – are given values): R = r / 255 = 0.09 G = g / 255 = 0.38 B = b / 255 = 0.46 Find the minimum and maximum values of … Read more
The RGB int color contains the Red, Green, Blue components of the color in its bits. You have to look at its binary or hexadecimal representation and not look at it as a whole integer number (not look at its decimal representation). An int has 32 bits, 3×8 = 24 is used to store the … Read more
Hex values are easier to copy and paste from your favourite image editor. RGB values are easier to manipulate with Javascript. (My favourite Hex colour value is #EDEDED and a site we made for a client involved in motorsport had a background colour of #F1F1F1 🙂 Ed.
If you want to convert hex to rgb you can use sscanf: <?php $hex = “#ff9900”; list($r, $g, $b) = sscanf($hex, “#%02x%02x%02x”); echo “$hex -> $r $g $b”; ?> Output: #ff9900 -> 255 153 0
This answer is not for Illustrator, but for ‘some other tool’, namely Ghostscript (download gs871w32.exe or gs871w64.exe). Ghostscript allows you to ‘re-distill’ PDFs (without an intermediate conversion to PostScript, the dreaded ‘refrying’ detour). Try this command: gswin32c.exe ^ -o c:/path/to/output-cmyk.pdf ^ -sDEVICE=pdfwrite ^ -dUseCIEColor ^ -sProcessColorModel=DeviceCMYK ^ -sColorConversionStrategy=CMYK ^ -sColorConversionStrategyForImages=CMYK ^ input-rgb.pdf And if you … Read more
I developed the following code to convert the NV21 to RGB, and it is working. /** * Converts YUV420 NV21 to RGB8888 * * @param data byte array on YUV420 NV21 format. * @param width pixels width * @param height pixels height * @return a RGB8888 pixels int array. Where each int is a pixels … Read more