palette

Can't set palette in bitmap

由 夙愿已清 提交于 2019-11-27 17:15:47
问题 I have been writing a PCX decoder and, so far, the PCX image itself parses fine, but I can't work out how to set the palette of a bitmap. I have created a bitmap like so: Bitmap bmp = new Bitmap(width, height, stride2, System.Drawing.Imaging.PixelFormat.Format8bppIndexed, pixels); But I can't seem to set the palette using the following method: for (int i = 0; i < 256; i += 3) { Color b = new Color(); b = Color.FromArgb(palette[i], palette[i + 1], palette[i + 2]); bmp.Palette.Entries.SetValue

How to reduce color palette with PIL

由 隐身守侯 提交于 2019-11-27 12:53:11
I'm not sure how I would go about reducing the color palette of a PIL Image. I would like to reduce an image's palette to the 5 prominent colors found in that image. My overall goal is to do some basic color sampling. That's easy, just use the undocumented colors argument: result = image.convert('P', palette=Image.ADAPTIVE, colors=5) I'm using Image.ADAPTIVE to avoid dithering tzot The short answer is to use the Image.quantize method. For more info, see: How do I convert any image to a 4-color paletted image using the Python Imaging Library ? Paul I assume you want to do something more

gnuplot matrix or palette using one line

由 陌路散爱 提交于 2019-11-27 08:04:34
问题 ..Hi all. I want to plot matrix color map (heat map), However I want plot heat map using data printed in one line. I tried, p for[i=5:15] 'line' u (i%2):(i/2%10):i+1 w image So gnuplot display warning image need at least 2dimension data My dataset is like this 0.1(node 1 value at time step 1) 0.1(node 2 "") 0.3(node 3 "") 0.2(node 4 "") 0.5(node 1 value at time step 2) 1.2(node 2 "") 0.7(node 3 "") 0.2(node 4 "") 0.8(node 1 value at time step 3) 2.2(node 2 "") 0.1(node 3 "") 0.1(node 4 "") 0

How to read 8-bit PNG image as 8-bit PNG image only?

由 人走茶凉 提交于 2019-11-27 07:25:54
问题 I have a 8-bit PNG image (See the attachment). But when I read it using Image.FromFile method, the pixel format comes as 32-bit. Due to this I am unable to modify the palette. Please help me. See below for the code I am using to read the file and update the palette. public static Image GetPreviewImage() { Bitmap updatedImage = null; try { // Reads the colors as a byte array byte[] paletteBytes = FetchColorPallette(); updatedImage = Image.FromFile(@"C:\Screen-SaverBouncing.png"); ColorPalette

Algorithm for color quantization/reduced image color palette in JavaScript? [closed]

由 99封情书 提交于 2019-11-26 19:55:47
问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 2 years ago . I'm writing a web app that takes a user-submitted image, gets the pixel data via a canvas element, does some processing, and then renders the image using vector shapes (using Protovis). It's working well, but I end up with several thousand colors, and I'd like to let the user pick a target palette size and

How to generate a number of most distinctive colors in R?

由 ╄→гoц情女王★ 提交于 2019-11-26 16:57:58
I am plotting a categorical dataset and want to use distinctive colors to represent different categories. Given a number n , how can I get n number of MOST distinctive colors in R? Thanks. JelenaČuklina I joined all qualitative palettes from RColorBrewer package. Qualitative palettes are supposed to provide X most distinctive colours each. Of course, mixing them joins into one palette also similar colours, but that's the best I can get (74 colors). library(RColorBrewer) n <- 60 qual_col_pals = brewer.pal.info[brewer.pal.info$category == 'qual',] col_vector = unlist(mapply(brewer.pal, qual_col

JS function to calculate complementary colour?

由 五迷三道 提交于 2019-11-26 11:39:36
Does anybody know, off the top of your heads, a Javascript solution for calculating the complementary colour of a hex value? There is a number of colour picking suites and palette generators on the web but I haven't seen any that calculate the colour live using JS. A detailed hint or a snippet would be very much appreciated. Stefan Kendall Parsed through http://design.geckotribe.com/colorwheel/ // complement temprgb=thisrgb; temphsv=RGB2HSV(temprgb); temphsv.hue=HueShift(temphsv.hue,180.0); temprgb=HSV2RGB(temphsv); function RGB2HSV(rgb) { hsv = new Object(); max=max3(rgb.r,rgb.g,rgb.b); dif

How to generate a number of most distinctive colors in R?

由 自闭症网瘾萝莉.ら 提交于 2019-11-26 04:58:33
问题 I am plotting a categorical dataset and want to use distinctive colors to represent different categories. Given a number n , how can I get n number of MOST distinctive colors in R? Thanks. 回答1: I joined all qualitative palettes from RColorBrewer package. Qualitative palettes are supposed to provide X most distinctive colours each. Of course, mixing them joins into one palette also similar colours, but that's the best I can get (74 colors). library(RColorBrewer) n <- 60 qual_col_pals = brewer
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