[Plugin] GreyscaleMode
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Hi Guys,
A word of caution; utiler has reported he was not able to get the right-click "revert" color option using this plugin. I'm not sure why, but it may mean that the script could "forget" your original material colors. I'm looking into it.
EDIT: There is no danger of loosing the original colors. The error was caused because the default color returns nil when asked for its material.
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Jim,
Thanks for the warning. I haven't seen that problem but I'll keep my eyes open and let you know.
Dave
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Hi,
This happens when the face has default material, here is the error message:
Error: #<NoMethodError: undefined method `get_attribute' for nil:NilClass>because in the code, line 16:
material = sel.material -> equals nil when no material on face
then line 18:
rgb = material.get_attribute("GreyScaleColors", 'rgb')
get_attribute method can be used on nil
and then no context menu.
This would be better:if sel.typename == "Face" and sel.material material = sel.material ...@unknownuser said:
it may mean that the script could "forget" your original material colors
This is impossible IMHO... Attributes on non-geometric objects such as layers and materials, once set, cannot be accessed by the user, lost, erased, or forgotten, unless the script itself does erase them.
Last note: I've been told that (red+green+blue)/3 does not give an exact gray value. What Gimp or PS do to desaturate an image for instance is:
gray_value=([red,green,blue].max + [red,green,blue].min)/2.0
Sketchup::Color.new( gray_value, gray_value, gray_value )
My 2 cts (of Euros
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The plugin goes through all in-model materials and changes them to a grey value. The default face color is completely ignored as it does not appear in the in-model materials list, and this is when the material is nil.
So the question is, should the plugin also change the default face color to a grey value?
Does anyone have a preference for how the greyscale value is calculated? If not, I will try the method suggested by Didier.
Thanks, Didier for taking the time to help.
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I never export images, etc from SU with the default face color. In fact if we did this in grey scale without adding additional color to the scene then grey scale would be a constant....
Here is another nice example of grey scale output. [not mine]
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I guess I'm not too picky about how the grays are determined. At this point the average of the RGB values seems to work fine but if there's another option, I'm willing to go that way. As far as the default material being turned to a gray, perhaps it could be left alone? THis would make it easier to identify faces that haven't been given a material.
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True Dave, the default color can go it alone....
As for grey scale variation, If we didn't have variation i think it would shade quite bland IMHO...
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Andrew, you have a point about the potential for blandness. (I think I just made up a word.)
I'm sure it would add to the complexity of the plugin but suppose one could choose some sort of filter factor. Suppose that you want to simulate a 25 Red filter. You might choose Red from a list of filters which would give green colors lower values (make them darker) while reds would tend to be higher values. This would give you the ability to tune the grays to prevent some colors from being too close together on the gray scale.
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Here's another example of using the Grayscale Plugin. This is raw SU output.
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Awesome Dave!!!
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Thank you Andrew. There's not much color in this model anyway but I like the effect with the grey scale option. I like that the wood grain still shows this way, too.
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@dave r said:
...but suppose one could choose some sort of filter factor. Suppose that you want to simulate a 25 Red filter. You might choose Red from a list of filters which would give green colors lower values (make them darker) while reds would tend to be higher values.
do I understand it correctly that with this method you could even create a sepia effect (with some colours standing out of course
). that would be such a cool thing! -
I hadn't thought of it that way but I suppose since we're asking for the moon...
I was really thinking more of "filters" for controlling values of gray to preventtwo adjacent colors from looking like the same value of gray. I'm sure you've seen the example from the old photography texts of the red, green and yellow apples shot through different colored filters on black and white film. I tried to find that photo in a quick Google search but came up empty.
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@dave r said:
I hadn't thought of it that way but I suppose since we're asking for the moon...
I was really thinking more of "filters" for controlling values of gray to preventtwo adjacent colors from looking like the same value of gray. I'm sure you've seen the example from the old photography texts of the red, green and yellow apples shot through different colored filters on black and white film. I tried to find that photo in a quick Google search but came up empty.
I'm sure it can be be done, although I don't know the math involved in filtering/masking colors. To combine the ideas, a set of filter settings could be saved as a preset - named Sepia, or Black & White, as examples.
off to day job... later.
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@unknownuser said:
or Black & White,
Hey !! That is exactly what I wanted to ask !! 
The same render that "Hidden lines" tool of the "Face Style" Toolbar... But we can color some entities !!!
Great
Thank you Jim ! -
wow, this is becoming bigger than i thought....
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Greetings Jim:
This plugin is a great addition. We can now insert
a pdf from Lay Out and import it into cad programs
like Vector and make a BW presentation on the actual
Construction Documents.Thanks,
DonVid
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too right Jim, and nice work.
this little script portrays a nice soft presentation to both schematic and final design.... -
I made 2 small updates:
- Right-clicking Groups and Components gives you the Revert Color option.
- Implemented the suggested grey color calculation of: color = 0.3 * red + 0.59 * blue + 0.11 * green
Download it from the first post of this thread.
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Hi Jim,
Thanks for the update. I see when opening the script that you have added the math. I don't see the Revert color option when clicking on a component, though. Is it just me?
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