Paintings.png-atlas

This feature is exclusive to Java Edition.

paintings.png-atlas is a procedurally-generated texture atlas used to store textures for all paintings.

paintings.png-atlas is a fixed-width 512×256-pixel file that stores textures for all paintings.

Java Edition
1.14	19w07a	Added `textures/painting-atlas`, following the splitting and deprecation of `paintings_kristoffer_zetterstrand.png`.
1.15	Pre-release 1	Renamed `textures/painting-atlas` to `paintings.png-atlas`.
1.19.3	22w42a	As an optimization to resource pack loading, everything in the relevant directory is compiled into this atlas, rather than only those sprites which are used by the game. For this specific atlas, there is no resulting visual change.
1.19.3	22w46a	A customizable atlas json file has been added which can be used to control which graphics are added to this atlas.
1.19.4	Pre-release 3	The way in which sprites are arranged on atlases has been changed considerably, resulting in atlas dimensions being generally smaller.
1.19.4	Pre-release 3	This atlas can now be exported to the screenshots folder using F3+S.

Game version		Atlas	Changes	Notes
Main	Development	Atlas	Changes	Notes
1.14	19w07a		Introduction.
1.15	Pre-release 1		Rearranged, for unknown reasons.
1.17	21w11a		Back texture updated.^[1]
1.19	22w16a		Added: Earth, Fire, Water and Wind.
1.19.3	22w46a		Rearranged, for unknown reasons.
1.19.4	Pre-release 3		Rearranged due to packing optimization.
24w14potato			Added: Hot Potato, In The Spotlight, Potato, Self-portrait, Tasty Shapes, The Treachery of Potatoes and This is not a potato.
1.21	24w18a		Added 20 paintings^{[note 1]}
1.21.7	Release Candidate 1		Added: Dennis.
1.21.11	25w44a		All textures now have an extra pixel of padding in all four directions. This negatively impacts tiling efficiency.^[2]

↑ Backyard, Baroque, Bouquet, Cavebird, Changing, Cotán, Endboss, Fern, Finding, Humble, Lowmist, Meditative, Orb, Owlemons, Passage, Pond, Prairie Ride, Sunflowers, Tides and Unpacked.

Sources