I have implemented in C++ an example of color table applied to a band, taking
as reference the python script reported in this thread:
Ludwig wrote:
>
> colorTable = gdal.ColorTable()
> greentransparent = (0, 255, 0, 0)
> blue = (0,0, 255,255)
> colorTable.SetColorEntry(0, greentransparent)
> colorTable.SetColorEntry(1, blue)
> b = image.GetRasterBand(1)
> b.SetRasterColorTable(colorTable)
>
My code:
// Create a color table for the Air Quality output image
GDALColorTable *colorTable = new GDALColorTable();
GDALColorEntry black, green, yellow, orange, red, lightRed;
// Setting RGB colors for 6 classes
black.c1 = 0; black.c2 = 0; black.c3 = 0;
black.c4 = 0;
green.c1 = 0; green.c2 = 255; green.c3 = 0;
green.c4 = 0;
yellow.c1 = 255; yellow.c2 = 255; yellow.c3 = 0;
yellow.c4 = 0;
orange.c1 = 255; orange.c2 = 150; orange.c3 = 0;
orange.c4 = 0;
red.c1 = 255; red.c2 = 0; red.c3 = 0;
red.c4 = 0;
lightRed.c1 = 150; lightRed.c2 = 0; lightRed.c3 = 0;
lightRed.c4 = 0;
// Link every color to a pixel value
colorTable->SetColorEntry(0, &black);
colorTable->SetColorEntry(1, &green);
colorTable->SetColorEntry(2, &yellow);
colorTable->SetColorEntry(3, &orange);
colorTable->SetColorEntry(4, &red);
colorTable->SetColorEntry(5, &lightRed);
// Apply the table to the band
myOutBand->SetColorTable(colorTable);
// Delete the GDALColorTable object
delete colorTable;
I hope this could be helpful for someone.
--
View this message in context:
http://osgeo-org.1803224.n2.nabble.com/Transparent-PNG-with-color-table-palette-tp2030306p5190147.html
Sent from the GDAL - Dev mailing list archive at Nabble.com.
_______________________________________________
gdal-dev mailing list
gdal-dev@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/gdal-dev
