Making these edits in a long editing session yields large amounts of pixel data that must be kept around to support undo operations. That is, making an edit such as painting with a brush will result in new pixel data which can be just as large as the original pixel data. Many operations in Photoshop are what we call destructive operations.
Photoshop supports a very large undo history. As a result, the amount of memory required can be several times more than the amount of space a document uses on disk or in cloud storage. When a file or document is read, all of the image data is decompressed to allow for more efficient processing. The Photoshop file format stores data with lossless compression. The files edited in Photoshop often require more memory than a user has available on their device, due to the many features offered by the software, the types of digital design and editing it is used for, and the capabilities of user devices. Opening a file for editing requires a large amount of memory, significantly more than opening a file for viewing.
And, in the case of WebAssembly, how Photoshop works with files larger than the 32-bit address space of wasm32. In this article, we want to focus on how Adobe Photoshop engineering solved working with files larger than can fit into memory.
#Dst viewer for photoshop software#
The software makes innovative use of WebAssembly with features like SIMD, high performance storage in the origin private file system, the P3 color space for canvas, and Web Components with Lit. In 2021, Adobe, together with Chrome engineering, brought a version of Photoshop to the web.
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