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What is jpeg62.dll?


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Windows Process Description:

The jpeg62.dll file is described as the library and the tools for JPEG image compression. This module contains a library to implement JPEG image compression and decompression.

JPEG is a standardized compression and decompression method for full-color and gray-scale images. JPEG is intended for authentic views, usually pictures, and cartoons and other non realistic images are not its strong suit. JPEG output images are not identical to the input image. The output image quality can be traded off by the user against the size of the compressed file by adjusting a compression parameter.

The jpeg62.dll module has a JPEG compressor and decompressor, and each of them is divided into two main sections: the JPEG compressor or decompressor proper, and the preprocessing or post processing functions. The interface between these two sections is the image data that the official JPEG specs regard as its input or output. This data is in the color space to be used for compression, and it is down sampled according to the sampling factors used. The preprocessing and post processing steps used by the jpeg62.dll module are responsible for converting a normal image representation to or from this form.

By itself, the jpeg62.dll module handles only interchange JPEG data streams - in particular the widely used JFIF file format. The jpeg62.dll module can be used by surrounding code to process interchange or abbreviated JPEG data streams that are embedded in more complex file formats.

The jpeg62.dll file includes a substantial amount of code that is not covered by the JPEG standard but is necessary for typical applications of JPEG. These functions pre-process the image before JPEG compression or post process it after decompression. They include color space conversion, down sampling / up sampling, and color quantization.

Using the jpeg62.dll module, a wide range of quality vs. speed tradeoffs are possible in JPEG processing, and even more so in decompression post processing. The decompression component of the jpeg62.dll module provides multiple implementations that cover most of the useful tradeoffs that ranges from very high quality down to fast preview operation. On the compression side of the jpeg62.dll module, compression is normally less time-critical and it should be understood that the low-quality modes may not meet the accuracy requirements of a JPEG standard; nonetheless, they are useful for viewers.

Author: Independent JPEG Group

Author URL:

Part Of: GNU32 for Windows

Memory Usage: Low

Associated Applications: Common graphics software such as image viewers

Background DLL: No

Uses Network: No

Hardware Related: No

Common Path: Usually the installation directory used by the graphical software using the jpeg62.dll module, and not found in the system directory of the OS.

DLL Version: 6.2.1961.25445

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