feat: add additional color ramp with opacity #1337
Open
+64
−0
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
blacha
commented
Oct 23, 2025
blacha
commented
Oct 23, 2025
Individual Updatesnew-zealand_dem_hillshade_igor
Vector Style UpdateVector Style updated for st_topolite-hillshade-v2 |
Individual Updatesnew-zealand_dem_hillshade_igor
Vector Style UpdateVector Style updated for st_topolite-hillshade-v2 |
Individual Updatesnew-zealand_dem_hillshade_igor
Vector Style UpdateVector Style updated for st_topolite-hillshade-v2 |
Individual Updatesnew-zealand_dem_hillshade_igor
Vector Style UpdateVector Style updated for st_topolite-hillshade-v2 |
Individual Updatesnew-zealand_dem_hillshade_igor
Vector Style UpdateVector Style updated for st_topolite-hillshade-v2 |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
1 participant
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Motivation
The current igor hillshades are one band uint8 these work great inside of GIS tools like QGIS where users can configure these hillshades to "mulitply" the underlying layers,
For web based tools like maplibre it does not have the same level of layering options and only really allows "overlay" where a one band greyscale image does not work.
The goal here is to convert the one band uint8 into a transparency based layer so it can be overlayed inside maplibre and qgis with a standard overlay function.
To do this the colors are mapped from
0to RGBA 0,0,0,255 (black) and255to0,0,0,0(transparent)Using QGIS with the base layer and "multiply" vs QGIS with the opacity output
Modifications
Adding an additional color ramp for one band hillshades to make a opacity based hillshade
Verification