![]() Newer standards (TIF version 6) also allow JPEG compression algorithms within the format. Whereas the GIF format has limitations of 8-bit support, the TIF format offers complete 32-bit support. The TIF format offers LZW compression, the same compression used by the GIF file format. Resolution and colors are important factors in the print media and the TIF format excels at coping with these challenges. In addition, it allowed more control in print layouts. As such, it's raison d'être was to fill a requirement for a cross-platform file format that worked across operating systems, color spectrums, and graphic applications. The Tagged-Image File Format (TIFF or TIF) format is older than PNG, and was developed by Aldus Corporation (merged into Adobe Systems) along with Microsoft. Both TIF and PNG can store alpha channels, and both formats come in many variants. Back Between TIF and PNGīefore discussing differences between TIF and PNG, let's discuss similarities. Selections embedded in such alpha channels show up as transparent areas. PowerPoint imports TIF and PNG files with their alpha channels intact. It's just that TIF with its support for both RGB and CMYK spectrums is more suited for use in print rather than on screen. That's not to say that TIF files are inferior in any way. Also, TIF files are usually bulkier than their PNG counterparts. Of the two, PNG is more suited since PowerPoint's PNG support is better than its TIF support. PowerPoint supports the alpha channels prevalent in PNG and TIF files. Proprietary file formats (with multi-layer capabilities) used by applications like Adobe Photoshop (PSD) and Corel PhotoPaint (CPT) can store multiple alpha channels. This A channel is the alpha channel.įile formats like PNG or TIF can support a single alpha channel. While white stands for 100% opaque, black represents 100% transparent and the shades of grey in between represent varying degrees of transparency. This A channel is basically a selection or mask represented in 256 colors of the grayscale spectrum. In addition, some bitmaps can also store 256 levels of transparency they have an ability to incorporate an 'A' channel. ![]() These values signify 256 possibilites each of red, blue and green. In simple terms, this means that every tiny dot in a picture is composed of a blend of varying values. ![]() Images and video files store the visibility components of color in these three RGB channels. These are the colors of light and are mixed in specific values to output the TrueColor spectrum we're so used to seeing presently. Most of us are aware of three visible color channels, which comprise RGB. 'Alpha channel' is a graphic term for a simple concept. And for those of you who still don't know what alpha channels are, here's a basic definition. It's difficult to find the word instanced in the PowerPoint help file or the manual, and yet here's a full page of juicy, interesting information on alpha channels here for you to read. And now there's an article on 'alpha channels'. You may have read a few of these articles and they have covered important PowerPoint elements like sound, autorun, text, fonts and narration. Introduction Alpha Channels in PowerPoint Between TIF and PNG PNG Variants PowerPlugs Headings Creating Alpha Channels Taking Further Troubleshooting Introduction
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