FFT black canvas on a baseball card

[JGeddes]

hello:

I am using the FFT RGB filter on a baseball card. I did the FFT RGB filter and got the static canvas screen as shown in the tutorial. But when I select the red channel by itself, I get an almost black canvas and no stars or center. I am working on the background layer only, everything has been flattened.

This did not occur the last time I used this filter. Can you give me a tip on what I may be doing wrong?

JGeddes

[Cameraken]

Hi JGeddes

Do baseball cards have texture?

You seem to be doing everything correctly. Even if there were no texture you should see a cross on a grey background
Could you post a sample?

Ken

[JGeddes]

I scanned the card at a very high DPI and if I reduce the card to a small size I am able to get the stars. But trying to work with the large size image 15x19 @ 240 DPI produces a black canvas in the red channel.

[JGeddes]

This is the card pattern. hard to see it in the card at 100KB or less

[byRo]

Originally Posted by JGeddes

the large size image 15x19 @ 240 DPI produces a black canvas in the red channel.

There's your answer. As you can see here , there is a limit on picture size of 3072 pixels. Your image is a bit outside.

If you scan @ 150 DPI, you'll be OK.

Is that really 15 inches? Or is it 1.5" @ 2400 DPI?

Rô

[JGeddes]

Scanning at 600 DPI allows me to get the desired effect.... The original was scanned at 3200 DPI and too large.

[JGeddes]

Yes the image will be a 16x20 sketch so I wanted to start with a deep scan since the card is only 3x5. The 600 DPI will easily transfer to 16x20 with an expanded edging.

JGeddes

[Cameraken]

Hi JGeddes

Thanks for posting a sample but Rô spotted the problem.

I have just run some tests on an image 4000x4000
With FFTrgb red channel is black.
Then I tried with FFThsl and that was the same. Black channel

Then I tried with Image Analyser and it worked. Stars working fine.

So the other way round this problem is to install IA available here

http://www.retouchpro.com/forums/software/7210-freeware-image-analyzer.html


Ken