q4z1\'s contributions

Hello daniel,

here are my contributions I made so far.

The convolution filter works perfect.

I also added some slider for adjusting Zoom, W/L and Brightness/Contrast. Brightness/Contrast are also added to the shaders.

I added two shaders for Monochrome1 format pictures, which invert the pic. Also added this feature to the thumbnails.

I adapted the default W/L values.

The measuring tool, works only at a scale of 1, because I did not yet figure out, how to sync with the scale.

Please give me some feedback!

Regards,

q4z1