PNG Raster background transparency

[Jordan Mandery]

Hello,

I have a orthophoto exported from Agisoft as a PNG with background transparency, I have not issues with the PNG in Autocad setting the background to transparent.
does 12d have this functionality? as i want to drape the raster over the TIN?

[Seb Woodland]

When you import the raster (or edit after input) to have a transparency, this is called blend and is a scale from 0 to 1.

The image is not necessarily draped to the tin via traditional tin drapes, rather it is applied as a visualisation feature.

View > Visualisation > Tin Render Settings > "Drape Rasters" (Select Model of rasters)

This can then be viewed in an Perspective OpenGL View with just the tin added to the view. The transparency can be controlled by the "Blending" of the tin render settings too.

In plan view it is merely controlled by model order. Try, View > Send Tin/Rasters to Back.

[Matthew Monk]

Seb, I think Jordan is after the ability to set the "background" (i.e. non image bits) transparent so they don't display. I think the blending applies transparency across the whole image (image and non-image bits). I haven't tried it, though, so could be wrong on how the blending works.

[Jordan Mandery]

Yea Mathew, correct, i've tried blending, that set the transparency for the entire image, not just the "background" (i.e. non image bits).
Ill host the image else ware you will see what i mean by the black sections of the raster that shouldn't be visible.

[Jake Shepherd]

Find a fix for this?

[Sam Cech]

Hi Jake
its really hard to tell what the fix should be... what is your specific issue? - I think there was bit of misunderstanding in this post

I haven't had issues with NULL parts of raster images (mainly from UAVs) they typically work
Sometimes the format/windows can kill the null cropped areas and shows them as BLACK, so you can use the Create/Edit raster panel
on the Source-Image tab there is a NULL colour option which will make that colour disappear but can cause other parts of the image that are truly black to also go
and the last tab CROP allows you to do the Cropping, which is typically a box, only available once you specify location, but there is also the crop boundary panel (String =>Rasters =>Set boundary) which allows you to crop to any shape

transparency is on the Output tab - I think this was the confusion on this post, it wasn't really talking about the blend == transparency
you can also achieve transparency with drawing a polygon fill over parts of the raster and setting the white colour solid to 50% == 0.5 and place it above the raster in plan view model order to make it transparent on plots

for Visualisation such as draping on tins, with multiple images and different crop areas etc, I often arrange those on a plan view, crop and mask out what I don't want or what I need and use the [Strings =>Raster => Plan to raster] panel to make a new composite Raster that I drape on the tin, it can also include text labels and strings and symbols anything you put on the plan will become part of the raster.

hope something in the above helps
Sam