Remove White plug-in
Does anyone know this one, or does anyone know a substitute? I am not talking about a different way to remove a background like masking etc. I am talking about exactly the effect that this plug-in produce.
Hope someone can help here. It is one of the most useful plug-ins I know.
If it's for PC, I can whip it out real quick. At least, I should be able to given the descriptions I've heard of it. Maybe add a few tweaks of my own.
Done for PC.
Filter > Tech Slop > Transparent Shades
No real error-checking, so if it gets wonky on ya, let me know.
Last edited by Stroker; 08-30-2005 at 11:51 PM.
When I checked this forum today, I had to roll my jaw up from the floor!
This is WAY beyond what I expected!!! Thank you. I did a brief test and it seems it does exactly what it should.
I have been searching all over the internet for this. I am sure many people will be happy for this! I will be sure to advertise it :-)
P.S. Yes, I use PC.
Can you please explain what you are using this for? whats the usage of such a filter, any examples?
and what exactly does this filter do? i couldnt find a description of it on the internet. maybe you can explain
You're welcome. But I must admit that I'm kind of surprised. First, I'm kind of suprised that I got it right from just the one little description that I could find about Remove White. Second, this can be done rather quick-n-sleazy using stock tools. I guess it just goes to show that different people have different flows.
If there really is a demand, I'll start a To Do List:
- Wiki node to describe and serve it up
- 16-bit support
- Proper Preview with selections
- Consider other methods of extrapolating the mask, like Lightness in Lab or Y.
In case Transparent Shades gets you into trouble, give Opacity Pump a whirl.
Limaze, I can explain it, but I can't really speak of uses.
The basic idea goes something like this:
- if pixel = white, then make pixel transparent
- if pixel = black, then make pixel opaque
- if pixel = shade of grey, then fade pixel appropriately
Last edited by Stroker; 08-31-2005 at 07:13 AM.
A very typical use for this filter is to remove a white background from a logo with antialiased edge. That should make the edge gradually transparent. You can then place it over a new background completely intact without any weird edges.
Another good use is to lift a signature from a white background. Any writing with a pen is not perfect, so it would be way to complicated to try to mask it.
I would definitely love 16 bit and LAB. I prefer to do my corrections in 16 bit and LAB, so that would help a lot.
Got up before the kids this morning and did some junk. Started the node, but still pretty bare. Added RGB 16-bit and proper Preview with selections. Even though I did the selection thing, Transparent Shades will totally ignore any transparency information already in the layer.
Doubt I'll add support for Lab 8-bit and Lab 16-bit.
Another great plugin, I did some experiments before to simulate that effect by hand in PHOTOSHOP, but never thought to make it as a plugin. you did great job.
here is my way. could be wrong, but the final result looks like the same.
1 make a new gray layer, what I meant gray here is form black to white,
R=G=B, like (100, 100, 100), 127 127 127 or 255 255 255, set the blending mode to difference
2 alt+ctrl+~ to select luminosity
3 turn off the gray layer and click the background
4 ctrl+j copy selected. turn off background layer, now you get the tranpsparent shades.
different gray value will get different result like in your plugin
because I did this before in my retouching work. so I usually put the transparent layer on top of the pure white to enhance skin if I want to make it lighter, or sometimes I just want to play with some pixels in a fixed range. say 100-157. my tutorial is from this method.
i just thought i can do that unclipping work using my method or the plugin
because the clipping area means the pixel value hit 255. so I use the picture in Ro's tutorial.
1 get the the selection when gray vallue is 255 255 255, save it in alpha channel1
2 set the 2nd gray value like 240 240 240, get another selection, saved in alpha channel2
3 run calculation command, the new selection=alpha1-alhpa2=clipped area.
4 play with levels to make the selected area lighter
5 load selection and add levels addjustment layer. set bleding mode to multiply and appy guassing blur on the mask to smooth the transition.
Last edited by realaqu; 08-31-2005 at 03:35 PM.
Now if only someone could do this for mac. I used "eliminate white" filter, works on my PC, but not on Mac for CS...bummer. Does anyone know of any filter of the sorts for Mac?
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