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A .cals file is a CALS raster graphic image. This format is a 1-bit image format that supports only two colors — black and white. These images can be stored uncompressed, or compressed using a lossless algorithm called CCITT group 4.

Since a CALS file uses only two colors, it can easily be converted into another image format. An indexed color format like GIF (.gif) or PNG (.png) will be the most efficient, while other lossless formats like bitmap (.bmp) and TIFF (.tif) are good options as well. Lossy formats, like JPEG (.jpg), may introduce noticeable compression artifacts with 1-bit images and should be avoided.

About File Helper

File Helper is a free web-based file utility that can open CALS Raster Graphic files and over 150 other file formats directly in your web browser. It displays file properties, including metadata, and image EXIF data, along with information about the corresponding file type. File Helper can also view and convert images to several common formats. Have an unknown file or a file without an extension? No problem — File Helper can identify over 15,000 file types.

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