Image Layer As Mask

From Ultrafractal Wiki

Here is a quick little demo of an image layer as a mask, with the mask having transparency related to your choice of hue, saturation or luminosity of the image. The imported images are all from my zip file. If you have already downloaded it you should have all the images.

Image Traps has been updated to add the hue/saturation/luminosity transparency stuff, so you will need to do a database update to get the latest version of reb.ulb.

AlphaDemo {
; Copyright © 2008 by Ron Barnett.
; Tweakable on the list.
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}

***

Ron Barnett

Here is another version, where I have also turned on image edge fading on the top layer, and changed the background.

AlphaDemo#2 {
; Copyright © 2008 by Ron Barnett.
; Tweakable on the list.
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}

***

Merhaba Lale!

Here is an image in which I used image masks to put the texture specifically where I wanted it. See for example, the layer named Clouds1.

Maybe this is what you are asking?

Cheers, Cornelia

CY4407v {
; Copyright © 2008 by Cornelia Yoder.
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}

***

Lale -

Is this what you mean???

zooreka


Fractal1 {
fractal:
  title="Fractal1" width=640 height=480 layers=2
  credits="Zooreka;7/15/2008"
layer:
  caption="Layer 1" opacity=100 method=multipass
mapping:
  center=-0.6812134775/-0.4711550405 magn=0.46301307
formula:
  maxiter=2 percheck=off filename="jp.ufm" entry="pixeljp"
inside:
  transfer=none
outside:
  transfer=linear filename="sam.ucl" entry="VoroniColoring"
  p_dcount="From Center" p_offset=0.0 p_psize=.5 p_thick=1.0
  p_regtile=yes p_regpar=4.0
gradient:
  comments="Simple grayscale gradient." smooth=yes index=0 color=0
  index=200 color=16777215
opacity:
  smooth=no index=0 opacity=255
layer:
  caption="Background" opacity=100 method=multipass transparent=yes
  mask=yes
mapping:
  center=-0.6812134775/-0.4711550405 magn=0.46301307
formula:
  maxiter=2 percheck=off filename="jp.ufm" entry="pixeljp"
inside:
  transfer=none
outside:
  transfer=linear filename="Standard.ucl" entry="Image"
  p_imageParam="Stonehenge.jpg]]"
gradient:
  smooth=yes index=0 color=8716288 index=100 color=16121855 index=200
  color=46591 index=300 color=156
opacity:
  smooth=no index=0 opacity=255
}

***

Lale,

"Is there any way of using an image layer as a mask? I want to add texture to the background, but I don't want it on or under the image. This is simple if you're using a single layer for the image, but I want to use several layers with limited iterations, then it doesn't work..."

I'm not exactly sure what you're after. You can use an image layer as a mask if it has a transparent area (a .png for instance), just like any other layer with transparency. If you wanted the texture of the image to supply the transparency then a special coloring algorithm would have to be written (one that converted the luminance of the image to transparency for instance - that's not a bad idea :-)) Does that answer your question?

Mark

***

Hi Antonio,

I've tweaked your Fractal1 to demonstrate how to use the WORD image as both a positive and negative mask. The secret to this is in the gradient of the prospective mask image...

Notice how the gradient on each "WORD" layer has just TWO points: one at the extreme left (position 0) and one at the extreme right (position 399). The left point controls the opacity of your "WORD" and the right hand point controls the background opacity.

Have a good look at the gradient used on each of these WORD layers to see how the imported image looks as a regular layer and how it behaves when attached as a mask. Hopefully you will then be able to use what you have learned on other images. :)

Chris


Fractal1 {
::8sxWDin2tTZyutNMQY47CQvDE6utJ1ildD4hgCUgCEDUg8AYMWiyi2iLgkux+tvUUKO2JuJF
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  fydf6n39/rv7xXck++w8Du3x34aPA7fBUdjsKC==
}

***

Hi folks,

I've been watching the discussion about importing images and using them as masks. Here's a way to do it.

In place of the standard ImageImport, load the DMJ_ImageColorize class. Set the Coloring Type to "channel extract", the Channel to "alpha", and the "Extract As" to any of the alpha types. For the Image Object inside DMJ_ImageColorize, again choose a DMJ_ImageColorize object. "solarize" and the Solarize Threshold to 0. Then for the Image Object inside that, import your image.

DMJ_ImageColorize is a convenient wrapper to import an image and apply a ColorTransfer object to the image as it's imported. And by default, it loads the DMJ_Colorize ColorTransfer, which can apply a variety of color effects to an image. It's not obvious that you can use the solarize mode to make a negative, but it will if you set the threshold to 0. That's what the inner ImageColorize does. The outer one then just extracts the alpha channel data, blanking out the color data.

There are a few color modes in Colorize that aren't completed yet--I didn't have time before UF was released, but I wanted to include what I did have. At the moment, you can't channel-extract any of the \YCbCr or YUV channels and the color filter is unimplemented. Everything else is done.

One of those modes is "apply gradient." This lets you use any element of the image (all of the working channel extract modes apply) to map to a gradient value. So if you have a grey-scale image, you can create a "pseudo-color" rainbow gradient and use the "apply gradient" mode to render the image in pseudo-color. At the moment you can only use the built-in gradient, but if anyone writes a GradientWrapper class you can use that instead. I've got some on my list, but I have more projects than time.

Damien Jones

Image Layer As Mask

From Ultrafractal Wiki

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