argb

I have two functions, one to return RGB values from a given Integer, and the other function does the reverse, providing it with RGB values it returns an Integer. I'm testing this by seeing if the integer i convert to RGB turns back from RGB into the original integer value, but I'm getting different values. def getRGBfromI(RGBint): blue = RGBint & 255 green = (RGBint >> 8) & 255 red = (RGBint >> 16) & 255 return red, green, blue def getIfromRGB(rgb): red = rgb[0] green = rgb[1] blue = rgb[2] print red, green, blue RGBint = (red<<16) + (green<<8) + blue return RGBint the test: i1 = 2147483647

I have some sliders in my application that allows the user to change ARGB colors, however I need to convert these values to a hex value like 0xff000000, which is solid black. This is what I have so far: protected int toHex(Color col) { String as = pad(Integer.toHexString(col.getAlpha())); String rs = pad(Integer.toHexString(col.getRed())); String gs = pad(Integer.toHexString(col.getGreen())); String bs = pad(Integer.toHexString(col.getBlue())); String hex = "0x" + as + rs + gs + bs; return Integer.parseInt(hex, 16); } private static final String pad(String s) { return (s.length() == 1) ? "0" +

This is a Link Embedding Messages in Digital Images using JAVA, they provide the sample code also, but when i tried to embed over 38 characters, it will give different output when i run the decode part. I am using 111x115 (6.38k) image. my question is in this article, it said n=(p-32)/8 , n is the maximum length of message and P is the number of pixels. so if i calculate the image i used, it will be n=(6380-32)/8=793.5. Since like i could store 793.5 characters in this image, but when i tried to put more than 38 characters, it will give me different output when i did decode part. (under 38

Background I've made a tiny Android library for handling bitmaps using JNI (link here ) In the long past, I've made some code of Bilinear Interpolation as a possible algorithm for scaling of images. The algorithm is a bit complex and uses pixels around to form the target pixel. The problem Even though there are no errors (no compilation errors and no runtime errors), the output image look like this (scaled the width by x2) : The code Basically the original Java code used SWT and supported only RGB, but it's the same for the Alpha channel. It worked before just perfectly (though now that I look

I am trying to convert a rgba buffer into argb, is there any way to improve the next algorithm, or any other faster way to perform such operation? Taking into account that the alpha value is not important once in the argb buffer, and should always end up as 0xFF. int y, x, pixel; for (y = 0; y < height; y++) { for (x = 0; x < width; x++) { pixel = rgbaBuffer[y * width + x]; argbBuffer[(height - y - 1) * width + x] = (pixel & 0xff00ff00) | ((pixel << 16) & 0x00ff0000) | ((pixel >> 16) & 0xff); } } I will focus only in the swap function: typedef unsigned int Color32; inline Color32