Sketch

[wAlex]

Hi,
Someone knows how i could get an effect like this?
http://i.imgur.com/fgmGz.jpg
I tried to recreate this effect with :

Code: Select all

		$im->modulateImage(120, 0, 100); 
		$im->embossImage(0,0.6);
		$im->sketchImage (1000 , 27 , 45 ); 
		$im->shadeImage ( 0 , 10 , 80 );
		$im->adaptiveBlurImage(0.8,0.9);

but what I got was this...horrible result
http://i.imgur.com/VrYGb.jpg
Someone can help me?
Thanks

[fmw42]

Starting from what image? Your result is not that bad. Try adding some one-sided white noise.

[wAlex]

from that image

[Bonzo]

I do not think sketch will give you that effect.

[wAlex]

How can I add one-sided white noise?
I know that sketch don't give me this effect, i've tried all possible way, but I can't achieve the result i want.
How can I do? Do you know some other way to realize that?

[fmw42]

How can I add one-sided white noise?
I know that sketch don't give me this effect, i've tried all possible way, but I can't achieve the result i want.
How can I do? Do you know some other way to realize that?

You can add one sided noise by (command line equivalent -- you will have to find the same functions in Imagick):

1) create a separate image the size you want using +noise Random
2) select any one channel
3) threshold that channel so that you have mostly black with white noise using -threshold XX%
or use -black-threshold XX% so that you get mostly black and some gray to white noise
4) composite the noise over your image using -compose screen

Here is an example

convert -size 128x128 gradient: grad.png
convert grad.png \
\( -size 128x128 xc: +noise random -channel g -separate +channel -black-threshold 95% \) \
-compose screen -composite grad_white_noise.png

[fmw42]

You could also manually create masks and for each mask use -sketch in a different direction.