Image Gurus - How to sharpen this image?

Goksly · 3 Jul 2008 at 23:14

Hi,
I've got the image below but I need to make the back as black as possible and the characters as white and clear as possible (or vice versa). Now I need to know what things I need to do (i.e. colour adjustments like hue / brightness / contrast) to achieve this. I have paint.net to mess around with settings, but ultimately this will be done programtically (so I won't have super advanced options available in photo shop).

All feedback welcome

SimonCHere · 4 Jul 2008 at 10:01

Read each pixels value and set it to 000000 or FFFFFF dependant on a threshold value?

Simon

Inquisitor · 4 Jul 2008 at 10:10

The result will be badly aliased if you do that.

You could think about trying to implement some kind of curves evaluation, a la Photoshop. Shouldn't be too difficult.

daz · 4 Jul 2008 at 10:25

Increase brightness a bit and then increase the contrast a lot.

Ice Globe · 4 Jul 2008 at 10:56

Very easy in photoshop, keeps it nice and crisp, but not sure if you have the same capabilities in paint.net

Just went to hue/saturation and increased the brightness of all yellows and reds to full and darkened everything else.

Assuming that's what you needed.

Goksly · 4 Jul 2008 at 13:40

Thanks for the help all. Ice_Globe that is spot on! I'll have a look into the .Net framework and see if I can adjust colour specific brightness!

MrWhippy · 7 Jul 2008 at 20:33

SimonCHere said:
Read each pixels value and set it to 000000 or FFFFFF dependant on a threshold value?

Simon

no, that's the way to go programatically.

do that as the first pass, then your choice of 2nd pass filter.
(antialias/gausian/marching cubes etc)

the clever thing would be for the program to work out what threshold value to use for itself.