ccpalettes / gd-indexed-color-converter Goto Github PK
View Code? Open in Web Editor NEWConvert an image to indexed color mode.
Home Page: http://ccpalettes.github.io/gd-indexed-color-converter/
License: MIT License
Convert an image to indexed color mode.
Home Page: http://ccpalettes.github.io/gd-indexed-color-converter/
License: MIT License
I use the following code with your lib to achieve a monochrome image with just black and white pixels in it (1 Bit colordepth):
$converter = new GDIndexedColorConverter();
$palette = array(
array(0, 0, 0),
array(255, 255, 255),
);
$new_image = $converter->convertToIndexedColor($image, $palette, 0.8);
imagepng($new_image, 'bwimage.png', 6);
But the resulting imagefile is written as RGB with 8-Bit colordepth:
root@server /tmp # file bwimage.png
bwimage.png: PNG image data, 76 x 96, 8-bit/color RGB, non-interlaced
I've tried to add filters, like found on the Internet, but they seem to have no effect on the output format:
$converter = new GDIndexedColorConverter();
$palette = array(
array(0, 0, 0),
array(255, 255, 255),
);
$new_image = $converter->convertToIndexedColor($image, $palette, 0.8);
imagefilter($new_image, IMG_FILTER_GRAYSCALE);
imagefilter($new_image, IMG_FILTER_CONTRAST, -1000);
imagepng($new_image, 'bwimage.png', 6);
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