Navigating RGB Blending views

[Bandurao Naik]

Dear OpendTect

While scanning the Spectral Decomp RGB blending attribute either in Time slice or Volume the color scheme for all RGB elements is getting adjusted to default color scheme which is rather annoying and for every slice one has to adjust the color bar and by this actual benefit of rgb blending visualization is lost.

Also, while navigating the time slices one has to use the mouse to move the slice up or down, instead it is beneficial to use up and down keys for the same. This utility may also be incorporated in volume visualization.

I hope this helps the OpenDtect users immensely.

Regards

SBR Naik

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[Paul de Groot]

Dear Mr. Naik,

Can you please be more specific on the scaling issue? When I load spectral components into an RGB volume viewer, all slices in the R, G and B slices are automatically scaled to the same scaling range. If I want to change the scaling range, I adjust the values next to the color bar icon. All slices are then scaled to the new range. This is what I expect. How would you like the elements to be scaled?

Your idea to use PgUp and PgDwn keys is interesting but it would be a rather special use of keyboard keys. A volume viewer has 6 sides that you can press in and out with your mouse. The PgUp and PgDwn keys would only operate on the upper face. I'm not sure how intuitive that is. Therefore, I am asking the user community if they would like to have this feature put on the wishlist. Please let us know if this is what you want.

BTW instead of pressing the sides of a volume viewer inside out, it is also possible to resize the volume viewer and then use it as a probe as we showed in this LinkedIn post.

Best regards,

Paul.

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Paul de Groot

Geoscience Manager

-----------------------------------------------------------------------------------------------------------------------   dGB Earth Sciences
Phone: +31 53 4315155 E-mail: paul.d...@dgbes.com Internet: dgbes.com

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[Bandurao Naik]

Dear Paul

What I meant was the default color range of all the data (3 different frequencies in spectral decomposition) being used in RGB blending is around 5 to 1400 or so. To have an appropriate and brighter look the color range must be adjusted to around 10 to 800. While navigation from once timeslice to other the color range will be automatically takes to default values (10-1400).

Best regards

SBR Naik

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[Paul de Groot]

Dear Mr. Naik,

Please have a look at this image below on how you can use Z-slices and keyboard short-keys Z and X to slice through an RGB volume. If you have saved your color setting for the volume with the SD components, you have to set the scaling for each of the components. You can either do this manually, or you use a fixed clipping percentage.

I assume your problem originates from a recent change in color handling. Previously, when you used a clipping percentage and stored your color setting with the volume, all elements were scaled with this clipping percentage. This meant that each display element computed its own clipping range from the amplitudes in the element. The result was that all elements were scaled slightly differently, which is not desirable. When you now save the color settings, we save the min and max clipping value so that all elements will be displayed exactly the same. 

For SD volumes this is not the way to go. Fortunately, as you can see in the image, you can set the values per channel quite easily. For now, I recommend not saving color settings for SD volumes. Furthermore, I will make a note on our wish list that we should rethink the save color settings for multi-component volumes. 

Thank you for bringing this to our attention. Best regards,

Paul.

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Paul de Groot

Geoscience Manager

-----------------------------------------------------------------------------------------------------------------------   dGB Earth Sciences
Phone: +31 53 4315155 E-mail: paul.d...@dgbes.com Internet: dgbes.com

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