CloudCompare forum

Hello,

is it possible to select and delete points with a specific color, e.g. if you want to erase all white points of your point cloud?

Thanks,
Patrick

You can convert RGB colors to one or several scalar fields (with Edit > Colors > Convert to SF). You can choose to export each component (R, G, or B) or the mean value ((R+G+B)/3) as a separate scalar field.

Then you'll be able to segment the points based on the SF values (Edit > Scalar fields > Filter by value). If you only want to remove white points, you can directly work with the composite SF.

Ok thank you this solves my problem :)

thank you a lot daniel,
it solves my problem :)

Hi daniel,

What if I would like to select green points RGB = (0, 255, 0) ?
The ideal would be to allow setting a custom scalar field from RGB values. For example, I could set X = 2^16 x R + 2^8 x G + B and find points where X=000000001111111100000000 in binary.

Would that be possible ?

Thanks a lot,

Jonathan

Oups this message was lost in the moderation queue :D.

For the records: https://github.com/cloudcompare/trunk/issues/363

Hi, The option Edit>Colors>Convert to Scalar Field is greyed out and not selectable, it's for a RGB scalar field that was generated using Tools>Sandbox>Distance Map...

What is missing from the RGB distance map to let it be selectable by RGB values?

Make sure the map is selected (and the original cloud, as this one remains selected after the tool has finished).

Edit> colours> Convert to scalar field
check boxes to enable all channels
Properties... Scalar Field Colours... scalar Fields dropdown active to select which channel

to get a specific R G B value.... you would have to first filter to the correct Red value...
Properties... SF Display Params ... Display Ranges... and use the sliders or enter number specifically

Edit> scalar fileds> filter by value, then Split

then change the scalar over to the next Green.... then filter...
and finally repeat for the last B field and filter.

This may be cumbersome... but if you actually know the RGB value in terms of 255:255:255, then you could do this.
you could probably use a tool like this to find the specific colour you intend to select for

https://www.ginifab.com/feeds/pms/color ... _image.php

We have the colorimetric segmenter for this now