Chasys Draw IES Help:

File Formats - Chasys Draw Image, version 3

What is CD5?

CD5 is Chasys Draw IES's native image file format, which supports all the features provided by the suite. It is a binary tag-based container format for images and animations. Image data in CD5 files is losslessly compressed using a highly optimized adaptive proprietary multi-pass algorithm. The current version is 3 revision 31, and offers many enhancements over previous versions. Although CD5 is designed to be used as a working format (i.e. a format for storing work that is currently being edited or that may need to be modified later), it may be used for distribution because the policy is to support all versions of it in future versions, a policy that has been observed faithfully since 2001.


What features does CD5 offer?

CD5 supports all image semantics available in the Chasys Draw IES suite. A few of these are:

Feature Comments
Lossless compression since ver. 1
Transparency via independent alpha channel since ver. 1
Large image support (up to 65,535 by 65,535) since ver. 2
Adaptive multi-pass lossless compression since ver. 2
Tag-based container format since ver. 3 rev. 00
Layers since ver. 3 rev. 01
Layer naming and notes since ver. 3 rev. 01
Multi-resolution since ver. 3 rev. 01
High Dynamic Range since ver. 3 rev. 01, currently not used
16-bit-per-channel Sampling since ver. 3 rev. 01, currently not used
Animation, frame-based since ver. 3 rev. 02
Metadata, including paths, text, adjustment layers and other data since ver. 3 rev. 05
Full UNICODE and UTF-8 support since ver. 3 rev. 10
Layer groups since ver. 3 rev. 24
Per-layer global transparency since ver. 3 rev. 26
Inter-frame compression with variable reference since ver. 3 rev. 30
Animation, object-based with descriptors since ver. 3 rev. 31

CD5 is an extensible format that allows for new features to be supported without changing the file format. New features rarely ever require a change to the CD5 file format specification; all that is required is application-level support.



Copyright © John Paul Chacha, 2001-2019