Gzipping PSDs; every art must be alpha premultiplied; added converter batch

work_files/graphics/! Artists must read me !.txt

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+All the images must be exported as .tga or .tga.gz. All the alpha must be premultiplied.
+
+It is recommended to use ImageMagick command line tool to convert PSD to TGA directly.
+
+    convert terrain.psd -colorspace sRGB -write mpr:temp -background black -alpha Remove mpr:temp -compose Copy_Opacity -composite terrain.tga
+
+'convert' is a ImageMagick's convert.exe, usually located at 'C:\Program Files\ImageMagick-7.0.8-Q16'
+
+If you have ImageMagick installed, please use included batch file.

work_files/graphics/! PSD to TGA imagemagick.bat

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+SET basefilename=%~d1%~p1%~n1
+SET inputextension=%~x1
+rem inputextension should be dot-psd
+
+IF "%inputextension%" NEQ ".psd" goto fail
+
+convert %1 -colorspace sRGB -write mpr:temp -background black -alpha Remove mpr:temp -compose Copy_Opacity -composite "%basefilename%.tga"
+
+exit
+
+:fail
+echo "File not PSD"
+pause
+exit /b 1