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                        [Bug] Biomes O' Plenty gray grass.
i have an issue
^ there is a gray looking biome
Colormap is missing i guess. Leaves and grass are wrong color. How can i fix this?
Can confirm with Minestrappolation 5's Clay Soil as well -- every white tile in this image is supposed to be sort of a lime green.

I'm sure there's probably some step I'm missing to manually define color overlays, but I couldn't find it in any of the documentation.
I have finally tracked down and also found a temp fix for this issue! DynmapBlockScan is rendering some mod blocks without biome-based coloring. Defining the block in modsupport/modname-textures.txt doesn't fix it because every time you load up DynmapBlockScan overwrites the changes. How to fix this particular issue:
- Copy biomesoplenty-textures.txt out one level to /renderdata folder (outside modsupport).
 - Find the entries that start with block:id=%grass.
 - Replace the following lines (match the data=#):
 
block:id=%grass,data=4,patch0=11000:txt0212,patch1=0:txt0015,patch2=11000:txt0212,patch3=11000:txt0212,patch4=1000:txt0213,patch5=11000:txt0212,stdrot=true
block:id=%grass,data=3,patch0=11000:txt0219,patch1=0:txt0020,patch2=11000:txt0219,patch3=11000:txt0219,patch4=1000:txt0213,patch5=11000:txt0219,patch6=11000:txt0220,patch7=11000:txt0220,patch8=11000:txt0220,patch9=11000:txt0220,blockcolor=txt0056,transparency=SEMITRANSPARENT,stdrot=true
block:id=%grass,data=1,patch0=11000:txt0221,patch1=0:txt0222,patch2=11000:txt0221,patch3=11000:txt0221,patch4=1000:txt0223,patch5=11000:txt0221,stdrot=true
block:id=%grass,data=2,patch0=11000:txt0224,patch1=0:txt0018,patch2=11000:txt0224,patch3=11000:txt0224,patch4=1000:txt0213,patch5=11000:txt0224,stdrot=true
The only thing i could not find a way to fix, is overgrown stone's texture rendering partially white on the sides. It looks like maybe dynmap would need to add a new modifier value that would support that block in particular because it goes further down the side than the typical modded grass block.
The rendering for BoP seems to have changed again. Here's an example of how the current rendering for BoP seems to work (somewhat)
I can't get Overgrown Stone to work, either. Here's how my grass blocks look:

block:id=%grass,data=0,patch0=0:txt0001,patch1=0:txt0002,patch2=0:txt0003,patch3=0:txt0003,patch4=0:txt0003,patch5=0:txt0003,stdrot=true
block:id=%grass,data=1,patch0=0:txt0004,patch1=1000:txt0005,patch2=0:txt0004,patch3=0:txt0004,patch4=0:txt0004,patch5=0:txt0004,patch6=0:txt0004,patch7=11000:txt0005,patch8=0:txt0329,patch9=0:txt0329,patch10=0:txt0329,patch11=0:txt0329,transparency=SEMITRANSPARENT,stdrot=true
block:id=%grass,data=2,patch0=0:txt0007,patch1=1000:txt0008,patch2=11000:txt0009,patch3=11000:txt0009,patch4=11000:txt0009,patch5=11000:txt0009,stdrot=true
block:id=%grass,data=3,patch0=0:txt0010,patch1=1000:txt0008,patch2=11000:txt0011,patch3=11000:txt0011,patch4=11000:txt0011,patch5=11000:txt0011,stdrot=true
block:id=%grass,data=4,patch0=0:txt0012,patch1=1000:txt0008,patch2=11000:txt0013,patch3=11000:txt0013,patch4=11000:txt0013,patch5=11000:txt0013,stdrot=true
block:id=%grass,data=5,patch0=0:txt0014,patch1=0:txt0015,patch2=0:txt0327,patch3=0:txt0327,patch4=0:txt0327,patch5=0:txt0327,stdrot=true
block:id=%grass,data=6,patch0=0:txt0017,patch1=0:txt0018,patch2=0:txt0019,patch3=0:txt0019,patch4=0:txt0019,patch5=0:txt0019,stdrot=true
block:id=%grass,data=7,patch0=0:txt0014,patch1=1000:txt0020,patch2=0:txt0330,patch3=0:txt0330,patch4=0:txt0330,patch5=0:txt0330,stdrot=true
block:id=%grass,data=8,patch0=0:txt0017,patch1=0:txt0022,patch2=0:txt0023,patch3=0:txt0023,patch4=0:txt0023,patch5=0:txt0023,stdrot=true
                                    
                                    
                                    
                                
Still an issues as of now, grey stone-y blocks insteda of BoP grass, same issue for me.
I grabbed the renderdata files generated by Dynmap Block Scan, modified them a bit, and got them to display the grass correctly. This was made with MC 1.12.2, Dynmap 3.0.1, Biomes O'Plenty 7.0.1.2444. Different versions might not work all that well, no guarantees. I also included a fix for the fluids (blood, honey, hot springs, poison, quicksand).
Both files are necessary (the models and the texture).
https://gist.github.com/raffitz/71e544e3f01aa484b765f3b67070a052
Folks, there has been a major release of Dynmap, and colour and biome colour was one of the things recently fixed.
Please do give it a go, and check out the alpha blockscan if you are brave too.
This is still an issue.