[gdal-dev] can GDAL render two images as if over-plotted?

[Michael Sumner]

Just an update, I have found out how to do this numerically.    Will
consider a PR for gdaldem if I can make it work at some point.

Thanks, Mike



On Tue, Jul 9, 2024 at 7:31 AM Michael Sumner <mdsumner at gmail.com> wrote:

> Is it possible to "layer" one image over another, the first at full
> transparency and the second with partial transparency?
>
> I'm thinking of combining a hillshade and a (partially) transparent
> color-relief image, a visual enhancement technique.   (I know how to do
> this downstream in R and Python or similar, I'd like to stay in C++'s warm
> embrace. )
>
> I can go and find out what "over plot" means when it comes to colour
> imagery, just wondering if there's anything in-built already.   This might
> be a nice additional mode to gdaldem (and is what I thought "color-relief"
> meant,  at first).
>
> Cheers, Mike
>
>
> --
> Michael Sumner
> Research Software Engineer
> Australian Antarctic Division
> Hobart, Australia
> e-mail: mdsumner at gmail.com
>


-- 
Michael Sumner
Research Software Engineer
Australian Antarctic Division
Hobart, Australia
e-mail: mdsumner at gmail.com
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