摘要：/* * The MIT License * * Copyright (c) 2011 Paul Solt, PaulSolt@gmail.com * * https://github.com/PaulSolt/UIImage-Conversion/blob/master/MITLicense.txt * */#import <Foundation/Foundation.h>@interface ImageHelper : NSObject { }/** Converts a UIImage to RGBA8 bitmap. @param image - a UIImage to 阅读全文

摘要：My Postcards app has a design screen where you can change colors of things, so I needed a color picker. A very easy way to make a color picker on just about any platform is to make some kind of color pallet image file, display it for the user to click on, and do a call like: getPixelColorAtScreenLoc 阅读全文

摘要：http://stackoverflow.com/questions/144250/how-to-get-the-rgb-values-for-a-pixel-on-an-image-on-the-iphoneMethod 1: Writable Pixel InformationI defined constants#define RGBA 4#define RGBA_8_BIT 8In my UIImage subclass I declared instance variables:size_t bytesPerRow;size_t byteCount;size_t pi... 阅读全文