Odd behavior from Halftone Filter

[moriaorc]

I'm getting some strange behavior from the Halftone filter. When I run the filter on an RGB image, the result is an image where the lights and darks are reversed (just like I had run Image>Adjustments>Invert before running the halftone filter). If I convert the image to grayscale, the halftone filter runs normally. Anyone have any ideas on why this filter is behaving like this?

I am running PS 7 on a Mac Powerbook G4 OS 10.4.5

 

[apepp]

...have u tried the other method? This is for CS, not sure about &...

To use the Color Halftone filter
Choose Filter > Pixelate > Color Halftone.
Enter a value in pixels for the maximum radius of a halftone dot, from 4 to 127.
Enter a screen-angle value (the angle of the dot from the true horizontal) for one or more channels:
For Grayscale images, use only channel 1.
For RGB images, use channels 1, 2, and 3, which correspond to the red, green, and blue channels.
For CMYK images, use all four channels, which correspond to the cyan, magenta, yellow, and black channels.
Click Defaults to return all the screen angles to their default values.
Click OK.

 

[moriaorc]

Yes, this gives the expected results. I think this will geve me the results I need. I was just curious as to why the halftone filter would give me an inverted result on my machine. I tried the experiment on a PC runing PS CS, and I did not get the inverted result.