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What is the .RL4 File Extension?

.RL4 File Extension Description:

The RL4 file extension is used to identify Bitmap Graphics. A bitmap graphics or raster graphics, also known as pixmap is a kind of memory organization used for file formats of images, which are stored digitally. The word 'bitmap' means map of bits or array of bits that are spatially mapped to create images. These raster images with RL4 file extensions are generally referred to bitmaps in synthetic or photographic forms, whether in memory or files. Generally, the files in the RL4 file extension are images.

Since bitmaps are used in many GUIs for their built-in subsystems of graphics, the ones with file extension RL4 are also used the same as the other bitmap formats. However, the difference of the files with the file extension RL4 is the bi-compression it was set. This bitmap data is compressed with an RLE or a run-length encoding format designed for 4-bit bitmap. The files with the RL4 file extensions use absolute and encoded modes.

In the encoded mode, the first byte pair contains the pixel numbers of the image file with the .rl4 file extension, which will be drawn with the color indexes in the next byte. The second byte has two color indexes already with nibbles in high-order, and the other in low-order. The first pixel uses the specification of the high-order nibble, and the second with the specifications of the nibble in the low-order and so on, until all pixels are drawn to complete the file created, and saved in the .rl4 file extension.

On the other hand, with the absolute mode, the first byte contains zero, and the next contains the color indexes number that follows. Subsequently, the bytes have color indexes in the high-order and low-order nibbles, with one color index for every pixel. Word boundaries are necessary to be aligned. The alignment starts with a storage unit, due to the row padding the format that the file extension RL4 requires.

Author: Microsoft Corp.
Author URL:
Related Applications: Windows Picture and Fax Viewer, Paint, XnView, Various Image Viewer Applications
Common Path: C:/ Program Files/


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What Causes .RL4 files Errors to Occur?

When experiencing errors with .RL4 files you are in all likelihood receiving a severe Windows registry error - the error may be the outcome of corruption in your registry and you should work to correct it at once to avoid additional damage to your operating system. Experiencing these errors places your computer in danger for fatal crashes, blue screen errors and even hardware failure.

Symptoms of .RL4 files Errors:

Common symptoms with .RL4 files errors include slower system performance, excessive application start up times, trouble saving documents, extended pauses in application procedures, applications closing without giving an error, input freezes and programs crash.

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