bmp | 易学教程

png to bmp

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问题 is there anyway that i can convert a png to a bmp in c# i want to download a image then convert it to a bmp then set it as the desktop background i have the downloading bit and the background bit done i just need to convert the png to a bmp 回答1: Image Dummy = Image.FromFile("image.png"); Dummy.Save("image.bmp", ImageFormat.Bmp); 回答2: Certainly. You'd want to load up a Bitmap object with your png: Bitmap myBitmap = new Bitmap("mypng.png"); Then save it: myBitmap.Save("mybmp.bmp", System

Why are bmps stored upside down?

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问题 Why are BMP images stored upside down and zero-padded so they are four-byte aligned? 回答1: Here's a quote from Petzold: So, in DIBs, the bottom row of the image is the first row of the file, and the top row of the image is the last row in the file. This is called a bottom-up organization. Because this organization is counterintuitive, you may ask why it's done this way. Well, it all goes back to the OS/2 Presentation Manager. Someone at IBM decided that all coordinate systems in PM—including

How can I read BMP pixel values into an array?

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问题 I'm writing code in C++ (on Windows) and I'm trying to extract the pixel values of a grayscale bmp. I don't care about keeping any of the metadata, and just want to store the pixel values in a char array. I haven't been able to find a standard or "typical" way of doing this manually, so I'm wondering if there's perhaps a simple library that people use to load bitmaps into memory. Thanks in advance! 回答1: Read the entire file into memory. There will be a small header at the front, and the rest

C++: What's the simplest way to read and write BMP files using C++ on Windows?

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问题 I would like to load a BMP file, do some operations on it in memory, and output a new BMP file using C++ on Windows (Win32 native). I am aware of ImageMagick and it's C++ binding Magick++, but I think it's an overkill for this project since I am currently not interested in other file formats or platforms. What would be the simplest way in terms of code setup to read and write BMP files? The answer may be "just use Magick++, it's the simplest." Related Question: What is the best image

Writing BMP image in pure c/c++ without other libraries

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In my algorithm i need create information output. I must to write boolean matrix in bmp file. It must be monocromic image, where pixel is white if matrix on such element is true. Main problem is bmp header and how to write this. Brian R. Bondy Without the use of any other library you can look at the BMP file format . I've implemented it in the past and it can be done without too much work. Bitmap-File Structures Each bitmap file contains a bitmap-file header, a bitmap-information header, a color table, and an array of bytes that defines the bitmap bits. The file has the following form:

read pixel value in bmp file

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问题 How can I read the color value of 24bit BMP images at all the pixel [h*w] in C or C++ on Windows [better without any 3rd party library]. I got Dev-C++ A working code will be really appreciated as I\'ve never worked on Image reading & have come to SO after Googling [if you can google better than me, plz provide a link]. 回答1: You can try this one: unsigned char* readBMP(char* filename) { int i; FILE* f = fopen(filename, "rb"); unsigned char info[54]; fread(info, sizeof(unsigned char), 54, f); /

Writing BMP image in pure c/c++ without other libraries

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问题 In my algorithm i need create information output. I must to write boolean matrix in bmp file. It must be monocromic image, where pixel is white if matrix on such element is true. Main problem is bmp header and how to write this. 回答1: Without the use of any other library you can look at the BMP file format. I've implemented it in the past and it can be done without too much work. Bitmap-File Structures Each bitmap file contains a bitmap-file header, a bitmap-information header, a color table,