C3Modder only works correctly for Caesar3 (C3Modder_v2 +Pharaoh)
For the Emperor - an error occurs when trying to save an isometric "diamond" image.
("ERROR_FILE_NOT_FOUND" error in the "visual.sou" file)
This is because the tile size in Emperor has been increased from 30px to 40px.
-------------------------------------------------------------------------------------------------------------
C3Modder_v2 for Emperor (fixed tile size)
wdfiles . ru/d0153e

- found bug, poliline +1 height in diamond for some isometric sprites; (not fixed)

-------------------------------------------------------------------------------------------------------------
"C3Modder_v2" for writing textures (Caesar3+Pharaoh+Zeus)
yadi . sk/d/OLeXXZOC3SG6w7

-------------------------------------------------------------------------------------------------------------
*.555 stores pictures and animation frames.
*.sg3 stores ID, offset, length, width, height, type, ..

-------------------------------------------------------------------------------------------------------------
"SGReader" v1.1 for reading textures
github.com/bvschaik/citybuilding-tools/releases/tag/sgreader-v1.1
In SGReader v1.0 ID indexing fixed from 0.
In SGReader v1.1 ID indexing fixed from 1.
The description in C3Modder says that indexing IDs from 0 is wrong and is only done for compatibility with SGReader v1.0.

-------------------------------------------------------------------------------------------------------------
An example of editing an image in Caesar3
Dimitrius, 2012
web.archive.org/web/20191206223846/caesar-iii.ru/bibliotheca/mod_gfx.html

-------------------------------------------------------------------------------------------------------------
My research
(use GoogleChrome for auto translate)
steamcommunity . com/sharedfiles/filedetails/?id=2770884452
steamcommunity . com/sharedfiles/filedetails/?id=2748181836