rgb | 易学教程

Convert a RGB Color Value to a Hexadecimal String

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问题 In my Java application, I was able to get the Color of a JButton in terms of red, green and blue; I have stored these values in three int s. How do I convert those RGB values into a String containing the equivalent hexadecimal value? An Example would be "#0033fA" 回答1: You can use String hex = String.format("#%02x%02x%02x", r, g, b); Use capital X's if you want your resulting hex-digits to be capitalized ( #FFFFFF vs. #ffffff ). 回答2: A one liner but without String.format: Color your_color =

How do you get the RGB values from a Bitmap on an Android device?

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问题 I want to get RGB values of bitmap in android but I cant do this so far. My aim is to obtain RGB values for each pixel of bitmap. Is there any specific function for android or anything else ?? Also I wonder that do I need colorMatrix() function? It is very important for my project. Thanks 回答1: This may be slightly late, but to clear up the confusion with the use of &0xff: In Java ints are 32 bits, so the (A)RGB values for each pixel are packed in 4 bytes. In other words, a pixel with the

How do you get the RGB values from a Bitmap on an Android device?

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Compare RGB colors in c#

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问题 I'm trying to find a way to compare two colors to find out how much they are alike. I can't seem to find any resources about the subject so I'm hoping to get some pointers here. Idealy, I would like to get a score that tells how much they are alike. For example, 0 to 100, where 100 would be equal and 0 would be totally different. Thanks! Edit: Getting to know a bit more about colors from the answers I understand my question was a bit vague. I will try to explain what I needed this for. I have

Convert RGB color to CMYK?

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问题 I'm looking for an algorithm to convert an RGB color to CMYK. Photoshop is performing the conversion below: R = 220 G = 233 B = 174 C = 15 M = 0 Y = 40 K = 0 回答1: The conversion from RGB to CMYK is dependent on the physical device/process being used to lay down the CMYK ink. These are represented in software as Color Profiles. ICC and ICM color profiles of physical devices determine the resulting colors. If you are not concerned with true representation on a physical device then use the

内存管理(16)——UI(19)——DeleteObject() 的使用

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六种GDI对象，画笔、画刷、位图、区域、字体和调色板。除了调色板之外，这些对象都是通过SelectObject选进设备描述表的。　　 This function returns the previously selected object of the specified type. 　　SelectObject将返回设备描述表中上一次选择的对象句柄。　　　　例： hPen = SelectObject (hdc, CreatePen (PS_DASH, 0, RGB (255, 0, 0))) ; DeleteObject (SelectObject (hdc, hPen)) ; 或： hPen = CreatePen(PS_DASH,0,RGB(255,0,0)); hOldPen = SelectObject(hdc,hPen); ```````balbalbalbalbalb`````````````` SelectObject(hdc,hOldPen); DeleteObject(hPen); 来源： CSDN 作者：小陆老师链接： https://blog.csdn.net/qq_34573534/article/details/103567051

How does one convert 16-bit RGB565 to 24-bit RGB888?

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问题 I’ve got my hands on a 16-bit rgb565 image (specifically, an Android framebuffer dump), and I would like to convert it to 24-bit rgb888 for viewing on a normal monitor. The question is, how does one convert a 5- or 6-bit channel to 8 bits? The obvious answer is to shift it. I started out by writing this: puts("P6 320 480 255"); uint16_t buf; while (read(0, &buf, sizeof buf)) { unsigned char red = (buf & 0xf800) >> 11; unsigned char green = (buf & 0x07e0) >> 5; unsigned char blue = buf &

Converting RGB data into a bitmap in Objective-C++ Cocoa

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问题 I have a buffer of RGB unsigned char that I would like converted into a bitmap file, does anyone know how? My RGB float is of the following format R [(0,0)], G[(0,0)], B[(0,0)],R [(0,1)], G[(0,1)], B[(0,1)], R [(0,2)], G[(0,2)], B[(0,2)] ..... The values for each data unit ranges from 0 to 255. anyone has any ideas how I can go about making this conversion? 回答1: You can use CGBitmapContextCreate to make a bitmap context from your raw data. Then you can create a CGImageRef from the bitmap

Get pixel's RGB using PIL

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问题 Is it possible to get the RGB color of a pixel using PIL? I'm using this code: im = Image.open("image.gif") pix = im.load() print(pix[1,1]) However, it only outputs a number (e.g. 0 or 1 ) and not three numbers (e.g. 60,60,60 for R,G,B). I guess I'm not understanding something about the function. I'd love some explanation. Thanks a lot. 回答1: Yes, this way: im = Image.open('image.gif') rgb_im = im.convert('RGB') r, g, b = rgb_im.getpixel((1, 1)) print(r, g, b) (65, 100, 137) The reason you

Get pixel's RGB using PIL

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