bmp

问题 I'm trying to create a function which is equivalent to the windows API GetPixel() function, but I want to create a bitmap of my screen and then read that buffer. This is what I've got (Mostly copy pasted from google searches), when I run it it only prints out 0's. I think I've got most of it right, and that my issue is that I don't know how to read the BYTE variable. So my question is, what do I need to do in order to get it to print out some random colors (R,G or B) with my for loop?

问题 I can't find a way to explain the pixel array in the following situation: I created a BMP image 2x2 pixels with MS Paint on Windows 7. Saved it as monochrome BMP (which I think means BMP with color depth 1 bit per pixel) This is how the image looks like when zoomed it (black pixel, white pixel, white pixel, black pixel) Then I open the bmp with a hex editor and I can see the following info: 00: 424d 4600 0000 0000 0000 3e00 0000 2800 BMF.......>...(. 10: 0000 0200 0000 0200 0000 0100 0100

问题 I tried to convert a 32-bit Bitmap to 32-bit PNG using PIL. from PIL import Image im = Image.open('example.bmp') print im.mode # it prints 'RGB', but expected was 'RGBA' im.save('output.png', format='PNG') The expected image mode is 'RGBA', but actually i get 'RGB'. I also tried the following code, but it does not work. from PIL import Image im = Image.open('example.bmp') im = im.convert('RGBA') im.save('output.png', format='PNG') 回答1: Ok, here is something to get started. Since I don't know

问题 How can I convert a BITMAP in byte array format to JPEG format using .net 2.0? 回答1: What type of byte[] do you mean? The raw file-stream data? In which case, how about something like (using System.Drawing.dll in a client application): using(Image img = Image.FromFile("foo.bmp")) { img.Save("foo.jpg", ImageFormat.Jpeg); } Or use FromStream with a new MemoryStream(arr) if you really do have a byte[] : byte[] raw = ...todo // File.ReadAllBytes("foo.bmp"); using(Image img = Image.FromStream(new

问题 How to find size in byte of 50 x 50 RGB color image? If the above image saved in BMP file with 54 bytes of header size, what is the total size of that BMP file? How to know the content of every bytes in BMP file? And how to know the hexadecimal value of it? 回答1: Assuming you mean in-memory requirements, the minimum amount of memory needed would be 50 * 50 * 3 ( width * height * numComponents ), or 7500 bytes for RGB. However, it might be faster to pad each scanline, for example to an even

问题 I have a PictureBox where I display an image (Let's call it Image1). There's a second image (Image2) which needs to be revealed as the user hovers the Image1 with the mouse. I only need to reveal part of Image2 (a 10X10 pixel size box), not the whole image as the mouse moves. Both images are BMP. How can I accomplish this task? I would think using overlays? I display the Image1 in the picturebox and then I load the Image2 in memory, now I just need to display the portions of the Image2 over

问题 I've already opened the bmp file( one channel grayscale) and stored each pixel color in a new line as hex. after some doing processes on the data (not the point of this question), I need to export a bmp image from my data. how can I load the textfile(data) and use stb_image_write ? pixel to image : #include <cstdio> #include <cstdlib> #define STB_IMAGE_WRITE_IMPLEMENTATION #include "stb_image_write.h" using namespace std; int main() { FILE* datafile ; datafile = fopen("pixeldata.x" , "w");

问题 I am working on a Media up-loader which uploads images to Server. Before start upload file i want to show small thumbnail of Image. I used Loader class to load image selected by user & used Canvas to draw image on it. This works fine with images like jpg & png. But for bmp file loader class doesn't work. Is there anyway to load bmp image in Flex & Convert it to BitmapData ?? 回答1: I didn't test the example, but you could try this: Parsing and displaying BMP files via ActionScript And read the

问题 I am using the WIA 2.0 library within Delphi XE to automate scanning. I am using the " ShowAcquireImage " function to provide an image to be saved to disc. I want to save the image in a compressed format such as png or jpg, but the library only seems to save in bitmap. Has anyone else seen this problem, and is there a workround? (Apart from saving to disc as a big bmp file, and re-loading into a TJpegImage/TPngImage object, that is). Thanks for any advice PhilW. This the code I am currently

问题 I need to read the header of a bmp file with python. I tried like this but it obviously returns just a bunch of non intelligible bytes: f = open(input_filename,"rb") data = bytearray(f.read()) f.close() print(data[:14]) My idea was to find a module, or something fast, in order to log image info while opening it. I know about this function in matlab that does exactly what i want: imfinfo() . But I can't find a counterpart in python. To be clear, this is what I get with matlab: FileModDate: '20