Actionscript 3 如何获得颜色的灰度值?
我正在使用下面的代码获取颜色,将其更改为灰度,然后保存。问题是它总是蓝色而不是灰色Actionscript 3 如何获得颜色的灰度值?,actionscript-3,flash,Actionscript 3,Flash,我正在使用下面的代码获取颜色,将其更改为灰度,然后保存。问题是它总是蓝色而不是灰色 newBitmapData = new BitmapData(bitmapWidth, bitmapHeight, true); // Extract individual red, green, and blue values for the pixel: rgbVal = bitmapData.getPixel(x, y); redVal = (rgbVal & 0xFF0000) >>
newBitmapData = new BitmapData(bitmapWidth, bitmapHeight, true);
// Extract individual red, green, and blue values for the pixel:
rgbVal = bitmapData.getPixel(x, y);
redVal = (rgbVal & 0xFF0000) >> 16;
greenVal = (rgbVal & 0x00FF00) >> 8;
blueVal = rgbVal & 0x0000FF;
grayVal = Math.floor(0.3 * redVal + 0.59 * greenVal + 0.11 * blueVal);
newBitmapData.setPixel(x, y, grayVal);
我错过了什么 您的“灰度值”只是其亮度,要使其亮度变为颜色,请执行以下操作:
newBitmapData.setPixel(x, y, Math.min(255,uint(grayVal))*0x10101);
您的“灰度值”只是其亮度,要使其亮度变为颜色,请执行以下操作:
newBitmapData.setPixel(x, y, Math.min(255,uint(grayVal))*0x10101);
您没有再次将红色和绿色移回:
redVal = (rgbVal & 0xFF0000) >> 16;
greenVal = (rgbVal & 0x00FF00) >> 8;
blueVal = rgbVal & 0x0000FF;
//shift red and green back to original positions
redVal = int(0.3*redVal)<<16;
greenVal = int(0.59*greenVal)<<8;
grayVal = Math.floor(redVal + greenVal + 0.11*blueVal);
redVal=(rgbVal&0xFF0000)>>16;
greenVal=(rgbVal&0x00FF00)>>8;
blueVal=rgbVal&0x0000FF;
//将红色和绿色移回原始位置
redVal=int(0.3*redVal)您没有再次将红色和绿色移回:
redVal = (rgbVal & 0xFF0000) >> 16;
greenVal = (rgbVal & 0x00FF00) >> 8;
blueVal = rgbVal & 0x0000FF;
//shift red and green back to original positions
redVal = int(0.3*redVal)<<16;
greenVal = int(0.59*greenVal)<<8;
grayVal = Math.floor(redVal + greenVal + 0.11*blueVal);
redVal=(rgbVal&0xFF0000)>>16;
greenVal=(rgbVal&0x00FF00)>>8;
blueVal=rgbVal&0x0000FF;
//将红色和绿色移回原始位置
redVal=int(0.3*redVal)