Impatica Knowledgebase

KB-000250: Which graphic formats should I use?

When creating graphics for PowerPoint presentations, there are several formats that you can choose for saving your images. The most common formats are BMP, GIF, JPG and PNG. Each of the formats is described below; how they are used and which format is best for which purpose.

BMP (Microsoft Windows Bitmap)
Bitmap (BMP) is the standard Microsoft Windows raster file format that has no compression rate. Normally, it is not a very efficient format because it is not compressed, which makes it unsuitable for online use and will increase the size of your source PowerPoint files considerably. However, during the impaticization process, Impatica for PowerPoint compresses the bitmap images included in your PowerPoint presentation making them suitable for online viewing.

GIF (Graphics Interchange Format)
If the image has fewer than 256 colors, GIF can render the image exactly. When the image contains many colors, the software that creates the GIF approximates the colors with the limited palette of 256 colors available. GIF is a very popular format due to its ability to animate using multiple layers and its support for transparency. Currently, Impatica products support animated gifs and 1-bit GIF transparency.

JPEG (Joint Photographic Experts Group)
JPG or JPEG works best for images with lots of subtle color variations, such as a photograph, but is not so suitable for graphics with areas of continuous color. It does not work so well on non-realistic images, such as cartoons or line drawings. It can contain millions of colors, but it does not support transparency. If you have any kind of image that has smooth, shaded transitions, in most cases JPEG is a better choice than GIF.

PNG (Portable Network Graphics)
PNG uses a lossless compression method (i.e. no degradation of image quality) like GIF. It has two formats, PNG-8, which supports up to 256 colors, and PNG-24 which supports millions of colors. PNG is of principal value if you have an image with large areas of exactly uniform color, but that contains more than 256 colors.

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