如何使用Imagick php生成具有调色板偏移量的bmp文件

Question

I'm trying to use Imagick via php to generate a 8bit bmp from jpg. But i would like the pixel colors to start at index 16 rather than 0. The code below shows how to generate the bmp in the correct format i need, but the palette index defaults to 0. Is there a way to make sure the palette start at another index?

$average = new Imagick( "icon.jpg" );
$average->setCompression(Imagick::COMPRESSION_NO);
$average->quantizeImage( 32, Imagick::COLORSPACE_RGB, 0, false, false );
imagecolorset ($average, 0, 255, 255, 255);
$average->setImageFormat( "bmp" );

header( "Content-Type: image/bmp" );
echo $average;

$average->clear();
$average->destroy();

Answer 1

我不认为Imagick内置了任何功能，因此您必须创建一个新的调色板（从具有偏移量的旧调色板中复制颜色），然后使用$pixel = $average::getImagePixelColor()然后执行$pixel->getColor()根据新的调色板，选择$pixel->getColor()和$pixel->setColor() 。