libpng

问题 How to know if palette png is with alpha or not? I get information about the image png_get_IHDR After that i look at color_type - PNG_COLOR_TYPE_PALETTE But i can\'t find how to know if this png image has alpha channel or not. 回答1: PNG supports transparency in two (or three) quite different ways: Truecolor or grayscale images with a separated alpha channel (RGBA or GA) Transparency extra info in the (optional) tRNS chunk . Which has two different flavors: 2a. For indexed images: the tRNS

问题 I got an email from Google play store regarding - \"Google Play warning: You are using a vulnerable version of libpng\". Email contains the below information - https://support.google.com/faqs/answer/7011127 I didn\'t use libpng library in my application anywhere. But, In my android application, I am using the OpenCV2.4.5 library. After searching in the internet, I came to know that the OpenCV library uses the libpng. My question - The upgrading of OpenCV2.4.5 to OpenCV3.1.0 will resolve \

问题 I\'m trying to load a PNG image using SDL but the program doesn\'t work and this error appears in the console libpng warning: iCCP: known incorrect sRGB profile Why does this warning appear? What should I do to solve this problem? 回答1: Libpng-1.6 is more stringent about checking ICC profiles than previous versions. You can ignore the warning. To get rid of it, remove the iCCP chunk from the PNG image. Some applications treat warnings as errors; if you are using such an application you do have