BMP - white planes when color solid

[p1337]

I can´t figure it out, why this is happening.
When I convert JPG files into BMP files then solid planes are replaced by white.

This is the case not only when the color is #000000

Example JPG
https://p1337.synology.me/lightpainting/img/thumb/190103002850.jpeg
Example resulting BMP
https://p1337.synology.me/lightpainting/examplepics/lp.bmp

is this an JPG read problem or an BMP write problem?

when the pixelhatch ist not solid, maybe call it grainy, then it should solve this problem.

[p1337]

solved it by putting an noise filter over it 👍

JUST ADD :

$magicianObj -> addWatermark('converter/filters/noise.png', '', 0, 99);