Alternative text labels aren’t visible onscreen, but they let VoiceOver audibly describe what's onscreen, making navigation easier for people with visual disabilities.Operation manual (for network scanner) LASER PRINTER Operation Manual (for network scanner) SHARP CORPORATION Be sure to become thoroughly familiar with this manual to gain the maximum benefit from the product. Provide alternative text labels for images and icons. Experiment with compression settings on each image to find the optimal value that yields an acceptable result. Even a small amount of compression can save significant disk space.

Most JPEG files can be compressed without noticeable degradation of the resulting image. Optimize JPEG files to find a balance between size and quality. This palette is not appropriate for photos. Using an 8-bit color palette reduces file size without reducing image quality. Use the 8-bit color palette for PNG graphics that don’t require full 24-bit color. Use PDF for glyphs and other flat, vector artwork that requires high-resolution scaling. Photo-realistic app icons, however, look best as PNGs. Its compression algorithm usually produces smaller sizes than lossless formats and artifacts are harder to discern in photos. It's a good choice for intricate artwork that requires effects like shading, textures, and highlights. PNG supports transparency and, because it's lossless, compression artifacts don't blur important details or alter colors. In general, use de-interlaced PNG files for bitmap/raster artwork. Produce artwork in the appropriate format. Snap the image boundaries to the grid to minimize half pixels and blurry details that can occur when scaling down. A grid keeps lines sharp and ensures that content is as crisp as possible at all sizes, requiring less retouching and sharpening. Deviceġ2.9' iPad iPad iPad iPad mini X S X X 8 7 6s High-Resolution Artwork Depending on the device, you accomplish this by multiplying the number of pixels in each image by a specific scale factor. Supply high-resolution images for all artwork in your app, for all devices your app supports. The version of this image would be 200px × 200px, and the version would be 300px × 300px.

High-resolution displays have a higher pixel density, offering a scale factor of 2.0 or 3.0 (referred to as and As a result, high-resolution displays demand images with more pixels.įor example, suppose you have a standard resolution image that's 100px × 100px. A standard-resolution display has a 1:1 pixel density (or where one pixel is equal to one point. The coordinate system iOS uses to place content onscreen is based on measurements in points, which map to pixels in the display.

Standard web image resolution