Qt 改变图片亮度算法

QImage Bright1(QImage &image,int brightness){uchar *line =image.scanLine(0); uchar *pixel = line;for (int y = 0; y < image.height(); ++y){pixel = line;for (int x = 0; x < image.width(); ++x){*pixel = qBound(0, *pixel + brightness, 255);*(pixel + 1) = qBound(0, *(pixel + 1) + brightness, 255);*(pixel + 2) = qBound(0, *(pixel + 2) + brightness, 255);pixel += 4;}line += image.bytesPerLine();}return image;}QImage Bright2(QImage &image,int brightness){QImage origin = image;QColor oldColor;int delta = brightness;int r=0,g=0,b=0;uchar *line =image.scanLine(0); uchar *pixel = line;QImage * newImage = new QImage(origin.width(), origin.height(), QImage::Format_ARGB32);for(int y=0; y<newImage->height(); ++y){for(int x=0; x<newImage->width(); ++x){oldColor = QColor(image.pixel(x,y));r = oldColor.red() + brightness;g = oldColor.green() + brightness;b = oldColor.blue() + brightness;newImage->setPixel(x,y, qRgb(r,g,b));}}return *newImage;} QImage Bright3(QImage& source, int factor){if (factor < -255 || factor > 255)return source;int red, green, blue;int pixels = source.width() * source.height();unsigned int *data = (unsigned int *)source.bits();for (int i = 0; i < pixels; ++i){red= qRed(data[i])+ factor;red = (red < 0x00) ? 0x00 : (red > 0xff) ? 0xff : red;green= qGreen(data[i])+factor;green = (green < 0x00) ? 0x00 : (green > 0xff) ? 0xff : green;blue= qBlue(data[i])+factor;blue =  (blue  < 0x00) ? 0x00 : (blue  > 0xff) ? 0xff : blue ;data[i] = qRgba(red, green, blue, qAlpha(data[i]));}return source;}