Ps4 Transparency Technote

Adobe® Photoshop® - Macintosh®/Windows ® Adobe Customer Support ® Creating Transparent Images in Photoshop What’s Covered Bitmap Images Clipping Path Transparency Grayscale and Color Images Transparent GIF Files An image’s file format determines whether it is transparent or opaque. File formats that support transparency include 1-bit (black-and-white) TIFF images, 1-bit EPS images, and indexed color GIF images. File formats that do not support transparency include color or grayscale images saved in PICT, TIFF, or EPS format. You can create transparent images or the appearance of transparency in Adobe Photoshop 3.0 and later using several file formats. Bitmap Images Bitmap images (i.e., black-and-white, 1-bit, and line art images) designate black pixels as “on” and white pixels as “off.” Because TIFF images do not specify whether the white pixels appear transparent or opaque, the application you import a 1-bit TIFF image into determines whether the white pixels are opaque or transparent. Most page layout applications (e.g., Adobe PageMaker, QuarkXPress) designate the white pixels in 1-bit TIFF images as transparent. The white pixels in a 1-bit EPS file saved in Photoshop can be either transparent or opaque. To save a 1-bit (Bitmap mode) EPS file with transparent white pixels: 1. Choose File > Save As. 2. In the Save As dialog box, select EPS from the Format pop-up menu. 2. Name the file and click OK (Windows) or Save (Macintosh). 3. In the EPS Format dialog box, select the Transparent Whites option, then click OK. Grayscale and Color Images Grayscale images describe each pixel as a shade of four to 256 grays, rather than using black pixels to form patterns that simulate gray shades. The white pixels in grayscale images are always opaque, because they are defined as a shade of gray. Color images describe each pixel as a color. RGB images describe colors using red, blue, and green values, and CMYK images describe colors using cyan, magenta, yellow, and black values. Index (Palette) images are similar to grayscale images, except that they use an index to map colors into an existing RGB color lookup table. The white pixels in color TIFF, PICT and EPS files are always opaque, because they are defined as a shade of color. …