custom masks

[samsc]

Thanks guys. This was the answer I was looking for.

MB

If you have some particular kindof of effect that you would like implemented that only requires a few parameters, then dont hesitate to tell me,

[jakepin]

Addendum to this recently concluded thread:

I'm creating a series of custom masks in an attempt to do an edge blend - well, corner blend really - between two rasters. A combination of orbital heads, ever-changing scenery and amount of content to be generated makes this something I would like to achieve in Catalyst rather than in After Effects, by dedicating Layer 4 specifically for masks.

What I've tried:
Creating still images with a large, smooth gradient as TIFF files with various combinations of true alpha transparency, white-black gradients with additional alpha, and straight (no alpha) white-black gradients.

What I've found:
TIFF with alpha transparency - doesn't show up in the server at all - blank pane.
TIFF white-black w additional alpha - shows up as black.
TIFF white-black, straight - Comes up fine in server as white-black. Color effects applied to it (best: "invert mask 2") work to an extent.

However: color effects drastically shorten and sharpen gradient. A gradient that takes 300 pixels in the orginal image to transition from full black to full white is condensed by the color effects to about 35-50 pixels, which is not sufficiently smooth or large for my corner blend.

In previous versions I used to create a gobo "movie" with a true alpha for this sort of thing. I was hoping to avoid that this time. Any ideas for achieving a smooth gradient with a still image?
__________________
Jake Pinholster

[tharding]

Try using a straight Photoshop file with transparency or PNG.

I personally use as high a resolution as possible and then scale it using scale and aspect to get a smooth mask.

I find with photoshop files that I need to put all colour to black so as to lose the white fringing on masks and drop shadows.

PNG on the other hand has a smooth transition from black to transparent.

I also turn on the black border in Visual FX so I am able to mask outside my created border.

Hope this helps

Cheers

Toby

[samsc]

somewhere in here is the problem of pre-multiplied alpha - or not....

an extra complication. im not even sure about this issue myself - but it certainly affects compositing.

http://www.td-grafik.de/ext/xfrog/alpha/
http://www.gimp.org/docs/plug-in/appendix-alpha.html

[samsc]

TIFF with alpha transparency - doesn't show up in the server at all - blank pane.
TIFF white-black w additional alpha - shows up as black.
TIFF white-black, straight - Comes up fine in server as white-black. Color effects applied to it (best: "invert mask 2") work to an extent.

sound to me like you didnt successfully save transparency in your tiff file.

there is a second tiff options dialog in photoshop cs when you save a tif.
it has an option 'save transparency'.

i just made a tif with 5 different vertical grads- some transparent some not.

if you load this into a catalyst layer - you will be able to see some of the blocks are transparent.