In general this means you always have to consider the number of colors They are not able to cover all L8 images. Performs better than LZW9, when drawing the image, but as mentioned To 16 colors, RLE is limited to 64 colors and LZW9 works for all L8 On the complexity of the image and number of colors.Įach algorithm has its limits of application, meaning, L4 is limited Both theĬompression (reduction) and decompression (performance) highly relies The performance for decompression when the image is drawn. The above table shows both the memory reduction from compression and The DMA2D is disabled to compare software rendering only. Transparent images should always be in L8_ARGB8888. The table below shows the preferred L8 format: Framebuffer format The L8_RGB565 format, because the color format then matches theįramebuffer format and is faster to copy to the framebuffer. Images and a 16-bit framebuffer (format RGB565), then you should use If you are using a serial flash (non-memory-mapped) to store the Without DMA2D (for example the STM32G0 or STM32F410). This format should therefore not be used unless you are on a platform Means that drawing images in this format is not hardware accelerated. The L8 format with a RGB565 palette is not supported by DMA2D. If the image is transparent the 32-bit format (ARGB8888) must be used: Format Solid images should be stored in L8_RGB888. Each color definition will therefore take up 2, 3, or 4 bytes. The palette colors can be 16-bit, 24-bit, or 32 bit colors. The size of the pixels is therefore width x height bytes. Working in a 16-bit color space right up to when you save a JPG minimizes the chance of banding in the final image.An L8 image with 4 x 4 pixels and a palette with 4 colors Use the File/Save for Web command to save the image as a JPG since it automatically converts the image into an 8-bit sRGB JPEG image and saves the file with the correct color space information embedded in it. If you don't do this then working color space (ProPhoto in my case but this also applies if you use aRGB) information is embedded in the file and the image colors will not be correct.Ģ. Use the Edit/Convert Profile/sRGB before using the File/Save As/JPEG command so that sRGB color space information is embedded in the 8-bit JPEG file. If saving from Photoshop as a JPEG then I do one of two things.:ġ. I normally save 8-bit sRGB JPGs directly from Lightroom since it automatically converts the file format and embeds the correct sRGB color space information in the image file. Saving JPGs is a separate process from saving TIFFs. If I want to do further edits to a TIFF I can open it from Lightroom with all layers intact by opening the original file or I can start with a flattened version by opening a new copy. I save all TIFF images with all layers intact and all TIFFs are returned to Lightroom to make keeping track of them easy. I never modify the background layer and do non-destructive editing as much as possible.ī&H - Tim Grey - Photoshop CS6 for the Photographer - YouTube In Photoshop work in 16-bit TIFF since ACR and Lightroom export images to Photoshop in that format. Work in 16-bit ProPhoto so that the color spaces in Lightroom (almost ProPhoto), Adobe Camera Raw, and Photoshop all match.
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