Posted: Sat Mar 14, 2009 11:24 pm Post subject: Sub pixel filter or similar effect
So I got this idea to make some images look like they would if you were looking at a tv two inches away and you see all the sub pixels, sort of a modern take on pointalism. I was wondering how the heck i can do this. Noise doesn't really work that way neither does pixelate: mosaic. I googled the crap out of it and read up on different pixel schemes for different displays and learned a ton but I haven't been able to come up with a some what automated process. I supose it would take creating some sort of filter that does what a display does. (an automated means would just be cool imho.) I thought about creating a sub pixel grid and eye droppering the colors of the original image and then adjusting the red green and blue "subpixels" in the grid to the coresponding RGB levels that photoshop gives me for the selected color. The only places i feel i might get into trouble would be in the anti aliased areas. Im just spit balling right now. How would you guys go about this? For more of an idea of where i want to be headed, heres a little description about subpixel rendering:
Joined: 30 Nov 2007
Posts: 85
Location: Estonia PS Version: CS4 OS: W7
Posted: Sun Mar 15, 2009 3:31 am Post subject:
Good morning teddyboy,
Try this:
1) Make a new image (Ctrl+N), width:3 pixels and height 1 pixel, click OK.
2) Select Pencil Tool and paint the 3 pixels to red, green and blue.
3) Select all (Ctrl+A).
4) Edit/Define Pattern, name it and click OK.
5) Go to the image where you wanted to add the effect.
6) Make a new layer (Ctrl+Shift+N).
7) Select Paint Bucket Tool, change Foreground to Pattern and pick your newly created pattern.
8 ) Click on the picture and set the blending mode for the layer to overlay.
Works best on high contrast images.
If you want the lines to be more visible, make a bigger pattern.
2 examples (first one is @400% and the second one is @300%):
alright so i tried your technique and got some satisfactory results. I added the mosaic filter to the original image so that it would line up with the sub pixels though now that i think of it i should have made the mosaic bigger so that 1 "pixel" of the image cover 3 sub pixels, though that would be difficult considering the increase of mosaic tile is in size in a 1:1 ratio. I also added a black edge around the pixels which you will notice is part of all crt displays. I also did some spherize and things to account for the curved screen, the keystone of an image on a tv screen and then the pixels of the image that should line up with the sub pixels (though one pixel should line up with three of the sub pixels.) So how can i make the mosaic filter go 1:3 if that is possible. also how can i make sure that the spherize of the two images line up correctly while taking into account the keystone of the image.
Another thing i am considering is trying to rig up a filter forge filter that might be able to do some thing like this. I did find this filter from filter forge and i don't know how much i like what it is doing but i didn't quite see what i wanted. Does anyone here use filter forge? How does it fit into your style, process, execution, result?
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