TV filter

toby

Mar 14, 2006

wrote:

Anyone know where I can find a filter that simulates the phosphor patterns on a TV? I’m after both the ‘three dots in a triangle’ arrangement and the alternating three line grid system.

Example images….

http://www.dansdata.com/images/io026/pointer_close.jpg
http://www.microscopy-uk.org.uk/mag/imgdec03/dw1.jpg

The following Filter Factory/Filter Foundry[1] formula, entered for R,G,B channels, duplicates the geometry of the second example:

(x/7)%3==0 && (x%7)<5 && (((y+12*((x/21)&1))%24)<22) ? c : 0

If you want a finer version, try:

(x/2)%3==0 && (x&1) && (((y+3*((x/6)&1))%6)<5) ? c : 0

It could duplicate the first example too, I’ll get back to you 🙂

[1] Filter Foundry is a free download from my site, see
http://www.telegraphics.com.au/sw/#filterfoundry

I also wouldn’t mind getting fold of some filters that simulate close-ups different kinds of print methods too.

toby

Mar 14, 2006

wrote:

Anyone know where I can find a filter that simulates the phosphor patterns on a TV? I’m after both the ‘three dots in a triangle’ arrangement and the alternating three line grid system.

Example images….

http://www.dansdata.com/images/io026/pointer_close.jpg
http://www.microscopy-uk.org.uk/mag/imgdec03/dw1.jpg

The following Filter Factory/Filter Foundry[1] formula, entered for R,G,B channels, duplicates the geometry of the second example:

(x/7)%3==z && (x%7)<5 && (((y+12*((x/21)&1))%24)<22) ? c : 0

If you want a finer version, try:

(x/2)%3==z && (x&1) && (((y+3*((x/6)&1))%6)<5) ? c : 0

It could duplicate the first example too, I’ll get back to you 🙂

[1] Filter Foundry is a free download from my site, see
http://www.telegraphics.com.au/sw/#filterfoundry

I also wouldn’t mind getting fold of some filters that simulate close-ups different kinds of print methods too.

toby

Mar 14, 2006

wrote:

Anyone know where I can find a filter that simulates the phosphor patterns on a TV? I’m after both the ‘three dots in a triangle’ arrangement and the alternating three line grid system.

Example images….

http://www.dansdata.com/images/io026/pointer_close.jpg

First cut formula for this, using 3×3 squares instead of circles: ((x+6*((y/4)&1))/4)%3==z && (y&3) && ((x+6*((y/4)&1))&3)<3 ? c : 0

Paste into R,G,B formulae boxes in Filter Factory/Filter Foundry.

http://www.microscopy-uk.org.uk/mag/imgdec03/dw1.jpg

I also wouldn’t mind getting fold of some filters that simulate close-ups different kinds of print methods too.

toby

Mar 14, 2006

toby wrote:

wrote:

Anyone know where I can find a filter that simulates the phosphor patterns on a TV? I’m after both the ‘three dots in a triangle’ arrangement and the alternating three line grid system.

Example images….

http://www.dansdata.com/images/io026/pointer_close.jpg

First cut formula for this, using 3×3 squares instead of circles: ((x+6*((y/4)&1))/4)%3==z && (y&3) && ((x+6*((y/4)&1))&3)<3 ? c : 0

Paste into R,G,B formulae boxes in Filter Factory/Filter Foundry.

Applying that filter, then Image Size to 500%, then Gaussian Blur (4.0), then adjusting Levels (right hand white arrow, under histogram, pull to left) leads to some interesting results, and also leaves you with circular spots with similar size to the example.

http://www.microscopy-uk.org.uk/mag/imgdec03/dw1.jpg

I also wouldn’t mind getting fold of some filters that simulate close-ups different kinds of print methods too.

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