bmp | 易学教程

not able to save an image file using c?

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问题 I tried to clone a bmp image into another bmp image but the final image would not open. #include <stdio.h> #include <conio.h> #include <stdlib.h> #include <process.h> void readBMP(char* filename) { int i; FILE* f = fopen(filename, "rb"); FILE* f1= fopen("save.bmp", "wb"); if (!f) { printf("Could not read file!\n"); exit(0); } unsigned char info[54]; fread(info, sizeof(unsigned char), 54, f); int width = *(int*)&info[18]; int height = *(int*)&info[22]; printf("%d %d\n", width, height); fwrite

What is wrong with this code for writing grey-scale bmp from an image RGB bmp pure C - Windows OS

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This is my function, I am using the headers BMP according to wikipedia BITMAPINFOHEADER. But, I am getting a file without any image...when putting padding, the process stops. // Structures for header info #pragma pack(push,1) /* Windows 3.x bitmap file header */ typedef struct { char filetype[2]; /* magic - always 'B' 'M' */ unsigned int filesize; short reserved1; short reserved2; unsigned int dataoffset; /* offset in bytes to actual bitmap data */ } file_header; /* Windows 3.x bitmap full header, including file header */ typedef struct { file_header fileheader; unsigned int headersize; int

Silverlight 4 BitmapImage - bmp file support

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MSDN mentions support for PNG and JPG, but many people are trying setSource(file.bmp) and complaining about "Catastrophic failures". Can someone clarify this, is bmp supported or not ? And if not, what is the best way for displaying a bmp in silverlight ? BMP is not supported in Silverlight. BMP is a very old and not a very efficient format (compared with PNG & JPG) so they have not bothered to support it. Silverlight only supports JPG & PNG format images. The best way to display them is to convert them on the web server so they can be served up as PNGs. The webserver will have access to

How to read bmp files in tensorflow?

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I'm trying to read BMP files in TensorFlow in the following way: reader = tf.TextLineReader() _, value = reader.read(filename_queue) filename, label = tf.decode_csv(value, [[''], [0]]) im = tf.decode_raw(tf.read_file(filename), tf.uint8) The error is the following: E tensorflow/core/client/tensor_c_api.cc:485] Input to reshape is a tensor with 44200 values, but the requested shape has 750000 [[Node: batch_processing/Reshape = Reshape[T=DT_UINT8, _device="/job:localhost/replica:0/task:0/cpu:0"](batch_processing/Slice, batch_processing/Reshape/shape)]] E tensorflow/core/client/tensor_c_api.cc

Tensorflow: How to encode and read bmp images?

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I am trying to read .bmp images, do some augmentation on these, save them to a .tfrecords file and then open the .tfrecords files and use the images for image classification. I know that there is a tf.image.encode_jpeg() and a tf.image.encode_png() function, but there is no tf.image.encode_bmp() function. I know that .bmp images are uncompressed, so I've tried to simply base64-encode, np.tostring() and np.tobytes() the images, but I get the following error when trying to decode these formats: tensorflow.python.framework.errors_impl.InvalidArgumentError: channels attribute 3 does not match bits

Python Pygame doesn't display images correctly

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问题 I'm new to Python and I started learning with "Python crash course" by Eric Matthes. I'm in the beginning of Pygame chapter and I follow the code, but my loaded images always look damaged and I don't know why. Code is from the book. First file: import pygame class Ship(): def __init__(self, screen): """Initialize the ship and set its starting position.""" # Load the ship image and get its rect. self.image = pygame.image.load('ship.bmp') self.screen = screen self.rect = self.image.get_rect()

Copying a bmp in c

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问题 Background: I want to copy a bmp (uncompressed 24 RGB) image from one file name to another. I am using the mingw compiler from TDM-GCC (version 4.9.2, 32 bit, SJLJ) that comes with codeblocks. Problem: Program works for black and white images and simple color images but not complicated color images. Please review attached images. I did not have enough reputation to post the other images so I tried posting the 2 most relevant. The program is unable to copy the lenna image. What is the cause

BMP（位图）介绍

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什么是BMP BMP（全称Bitmap）是Windows操作系统中的标准图像文件格式，可以分成两类：设备相关位图（DDB）和设备无关位图（DIB），使用非常广。它采用位映射存储格式，除了图像深度可选以外，不采用其他任何压缩，因此，BMP文件所占用的空间很大。BMP文件的图像深度可选lbit、4bit、8bit及24bit。BMP文件存储数据时，图像的扫描方式是按从左到右、从下到上的顺序。由于BMP文件格式是Windows环境中交换与图有关的数据的一种标准，因此在Windows环境中运行的图形图像软件都支持BMP图像格式。这里通过一个具体的例子对BMP格式做一个简单的介绍。 1.整体信息：位图文件可看成由4个部分组成： (1).位图文件头(bitmap-file header) 、一共14字节 (2).位图信息头(bitmap-information header)、一共40字节 (3).彩色表(color table) 、即调色板，大小可选 (4). 定义位图的字节阵列，即位图数据最常见的就是24位图，所谓的24位图，就是说一个像素的颜色信息用24位来表示，也就是说，对于三原色BRG，每一个颜色都用以字节（8）位来表示。除了24位图，还有1位（单色），2位（4色，CGA），4位（16色，VGA），8位（256色），16位（增强色），24位（真彩色）和32位等。对照图片进行分析

Copying a bmp in c

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Background: I want to copy a bmp (uncompressed 24 RGB) image from one file name to another. I am using the mingw compiler from TDM-GCC (version 4.9.2, 32 bit, SJLJ) that comes with codeblocks. Problem: Program works for black and white images and simple color images but not complicated color images. Please review attached images. I did not have enough reputation to post the other images so I tried posting the 2 most relevant. The program is unable to copy the lenna image. What is the cause for this behavior? Code: #include <stdio.h> #include <stdlib.h> #include <stdint.h> #pragma pack(1) /*

Issue while saving image using savefiledialog

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I'm using savefiledialog to save an image. Canvas is picturebox and the loaded image is bitmap. When I try to save it the file is created but somehow corrupted. Cause when I try againt load the image or show in different viewer it doesn't work - I mean the saved file is corrupted. There is an method for saving image. private void saveFileDialog1_FileOk(object sender, CancelEventArgs e) { System.IO.FileStream fs = (System.IO.FileStream)saveFileDialog1.OpenFile(); try { switch (saveFileDialog1.FilterIndex) { case 1: canvas.Image.Save(saveFileDialog1.FileName, System.Drawing.Imaging.ImageFormat