libpng | 易学教程

Python pygame error : Failed loading libpng.dylib: dlopen(libpng.dylib, 2): image not found

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问题 I installed the FlapPyBird repo from https://github.com/sourabhv/FlapPyBird. I have libpng installed but when i try to run the program with python flappy.py i get Failed loading libpng.dylib: dlopen(libpng.dylib, 2): image not found Any ideas about whats wrong? Thanks 回答1: Maybe you must install libpng ? You can do it with homebrew: brew install libpng 回答2: Use python3 interpreter and it will work 回答3: Try: brew unlink libpng && brew link libpng With me it was some problems with the linking.

How to encode PNG to buffer using libpng?

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问题 I'm currently using the following to write a PNG to a file: #include <png.h> #include <stdio.h> #include <stdlib.h> #include <stdint.h> /* Pixels in this bitmap structure are stored as BGR. */ typedef struct _RGBPixel { uint8_t blue; uint8_t green; uint8_t red; } RGBPixel; /* Structure for containing decompressed bitmaps. */ typedef struct _RGBBitmap { RGBPixel *pixels; size_t width; size_t height; size_t bytewidth; uint8_t bytes_per_pixel; } RGBBitmap; /* Returns pixel of bitmap at given

Writing a PNG in C++

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问题 I am trying to write some data to a PNG file using C++ with Visual Studio Express 2013 on Windows 7 64-bit. I understand that to do this, I need to use an external library, but here is where I'm having some difficulty. I tried using LodePNG - it looked simple, lightweight, and easy to use. The problem is, it was TOO simple, and seems to require data in a certain pixel format that doesn't match what I have. I could modify my data to make it compatible with LodePNG, but I'd much rather use a

CentOS系统上编译、安装、配置OpenCV

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声明：本文是个人根据相关博客资料加上自己的经验整理，在此分享以供大家学习交流！假设CentOS系统下的 CodeBlocks 已经安装完成，下面我们要在CentOS平台下编译OpenCV,并在CodeBlocks下进行开发测试。（1）下载OpenCV源码，并编译安装当前最新的版本是OpenCV-2.2，可以从 http://sourceforge.net/projects/opencvlibrary/ 上下载。 OpenCV的编译方式有两种，一种是传统的./configure ; make ; make install，这种方式适用于OpenCV-1.0，相应的编译过程可以参见这篇文章： http://www.opencv.org.cn/index.php/%E6%BA%90%E7%A0%81%E7%BC%96%E8%AF%91 ，另一种方式是使用cmake . ; make ; make install，这种方式适用于OpenCV-2.x。所以，在编译OpenCV-2.2之前，得先在CentOS上安装CMake（ http://www.cmake.org/ ）。（1.1）编译安装cmake：假设cmake-2.8.4.tar.gz放在/root/software/cmake-2.8.4.tar.gz cd /root/software/ tar zxvf cmake

PNG image texture format for color type 3

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问题 I have a PNG image of 128x128 dimension. When I read its IHDR chunk with libpng it shows that the image has color type 3. The problem is I cant find anywhere what should be the texture format for this color type. I want to draw this image with OpenGL. But without correct texture format the image color is not what it should be. And also If any reference could be provided where I can read detail about this matter will be greatly appreciated. I use this method to set texture format for other

Save OpenGL screen pixels to PNG using libpng

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问题 I've been using SOIL to save images as BMP, but it turns out that SOIL (or stbi to be more specific) saves ~5MB images (which is about 1366x768 resolution image or more) which is quite insane. Original BMP saving code ( NOTE Everything is done in the render function): uint8_t *pixels = new uint8_t[w * h * 3]; // copy pixels from screen glBindTexture(GL_TEXTURE_2D, screenTex); glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, w, h); glPixelStorei(GL_PACK_ALIGNMENT, 1); glReadPixels(0, 0, w, h,

Why Memory allocation failed whe HPDF_LoadPngImageFromFile using libhpdf?

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问题 I got a exception ERROR: error_no=1015, detail_no=0 using HPDF_LoadPngImageFromFile to load a png file with a jpeg file extention.I have libpng and libpng-dev installed. I can not figure out why this exception occurs. Anyone help me? Thanks. 回答1: LOL,I had compile libaru demo already....thanks stackoverflow..and libharu developer. ERROR: error_no=1015, detail_no=0 general , you must check your image file weather or not exist in current directory. indicate you c program want to load something

can not open input file libpng15-vc9.lib

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问题 I am setting up my GDAL 1.8.0 Project in Visual Studio 2010 Windows, I am on way to add libpng to project. My libpng release libs are under following folder... They are successfully built with zlib in this folder, as you can see there are no files missing as per VTP site. D:\libpng-16 And I have also changed additional libraries file names. Even though I added path in Property Manager, this error is still coming. Still I am getting following error Thank You in advance. 回答1: you should give

ubuntu repository for libpng

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问题 I need to upgrade libpng to libpng14 in ubuntu 10.0. do you know a suitable repository ? how can I add it my sources.list? regards 回答1: I know a ppa repository for 1.5 But you mentioned "upgrade" so I think you need libpng greater or equal 1.4 Try this one: https://launchpad.net/~hanmac/+archive/ppa/+packages 来源： https://stackoverflow.com/questions/6030593/ubuntu-repository-for-libpng

apt-get install fails with Not Found error because package removed from repository

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问题 I've been attempting to install the package r-base on Ubuntu Trusty Tahr and there's a package dependency that became broken in the last week. My commands are as follows: apt-get update -y apt-get dist-upgrade -y apt-get install -y r-base-dev ... Err http://archive.ubuntu.com/ubuntu/ trusty-security/main libpng12-dev amd64 1.2.50-1ubuntu2.14.04.1 404 Not Found [IP: 91.189.91.23 80] Fetched 92.8 MB in 28s (3262 kB/s) E: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/libp/libpng