Change white.png to w.png for save some part of texture text width (prevent going over 65536 bytes)).

README.md

@@ -20,3 +20,9 @@ CC BY-SA 4.0 - check LICENSE file
 Copyright (c) 2012-2022 jix xi, Jaspen den Quden, SFENCE and contributor (CC BY-SA 4.0):
 All textures not mentioned below.
 
+
+Developers:
+-------------
+
+w.png texture should be identical to sculpture w.png texture.
+

functions.lua

@@ -31,7 +31,7 @@ function painting.to_imagestring(data, res)
 		n = n+1
 		for _,p in pairs(ps) do
 			local y,x = unpack(p)
-			t[n] = ":"..p[1]..","..p[2].."=white.png"
+			t[n] = ":"..p[1]..","..p[2].."=w.png"
 			n = n+1
 		end
 		t[n] = "^[colorize:#"..hexcolour..")^"
@@ -40,10 +40,10 @@ function painting.to_imagestring(data, res)
 	n = n-1
 	if n == 0 then
 		minetest.log("error", "[painting] no texels")
-		return "white.png"
+		return "w.png"
 	end
 	t[n] = t[n]:sub(1,-2)
-	--print(table.concat(t))
+	--print("Image string len: "..string.len(table.concat(t)))
 	return table.concat(t)
 end
 

painting.lua

@@ -48,7 +48,7 @@ end
 
 minetest.register_node("painting:pic", {
 	description = S("Picture"),
-	tiles = { "white.png" },
+	tiles = { "painting_white.png" },
 	inventory_image = "painting_painted.png",
 	drawtype = "nodebox",
 	sunlight_propagates = true,
@@ -89,7 +89,7 @@ minetest.register_node("painting:pic", {
 minetest.register_entity("painting:picent", {
 	collisionbox = { 0, 0, 0, 0, 0, 0 },
 	visual = "upright_sprite",
-	textures = { "white.png" },
+	textures = { "painting_white.png" },
 
 	on_activate = function(self, staticdata)
 		local pos = self.object:get_pos()
@@ -185,7 +185,8 @@ local function apply_color(self, x, y, a, color)
 			r = math.round((add_clr.r*aa + have_clr.r*ha)/ja),
 			g = math.round((add_clr.g*aa + have_clr.g*ha)/ja),
 			b = math.round((add_clr.b*aa + have_clr.b*ha)/ja),
-			a = math.round(ja*255),
+			--a = math.round(ja*255),
+      a = 255, -- always without transparency
 		}
 		
 		self.grid[x][y] = RGBAToHex(new_clr)
@@ -225,7 +226,7 @@ local paintbox = {
 minetest.register_entity("painting:paintent", {
 	collisionbox = { 0, 0, 0, 0, 0, 0 },
 	visual = "upright_sprite",
-	textures = { "white.png" },
+	textures = { "painting_white.png" },
 
 	on_punch = function(self, puncher)
 		--check for brush.
@@ -370,7 +371,7 @@ local canvasbox = {
 
 minetest.register_node("painting:canvasnode", {
 	description = S("Canvas"),
-	tiles = { "white.png" },
+	tiles = { "painting_white.png" },
 	inventory_image = "painting_painted.png",
 	drawtype = "nodebox",
 	sunlight_propagates = true,