| FAQ |
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How to compress an image to Waaves format ?
Waaves compression is based on a quality index. Waaves quality index enables to tune the degradation
applied to your image and so that have automatically the best «Image quality / File size» ratio.
Waaves does not certify a file size but a visual quality. This feature enables to compress
image batch and be sure that all images will have the same visual quality at then end.
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How to set Waaves quality index ?
Waaves quality index is the parameter that manages image visual quality.
As described below, the value of the parameter must be a positive integer.
The zero value compresses a file in a loss less mode (binary identity between
the original image and the decoded image).
The compression ratio increases with the quality index, this means that quality level 10 will give
a better quality and less compressed file than quality level 20. However, a file size with a quality
index of 20 will be larger than the one with a 10 quality index.
| Image quality |
Color
(24 bits) |
Grayscale std
(8 bits) |
Extended grayscale
(10 to 16 bits) |
| Lossless |
0 |
0 |
0 |
| Visual lossless |
10 to 40 |
10 to 20 |
10 to 100 |
| Good quality |
40 to 100 |
20 to 40 |
- |
| Compact |
>100 |
>40 |
- |
|
(Warning: this table only represents examples of the most used
values and may not be consistent for every images)
With the same Waaves quality index you will have different compression rate depending on :
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the resolution of the original image ; |
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the original image compression ratio ; |
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Can use Waaves for lossless compression ?
Yes.
« 0 » Waaves quality index
(see How to set Waaves quality index?) compress images in lossless mode.
In that case the compressed image is certified a 100% identical to the original one.
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What can of images can I compress ?
Waaves 2.5 manages the following image types :
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Standard grayscale (8 bits per pixel, or 256 gray levels) |
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Extended grayscale (from 10 to 16 bits per pixel or
from 512 up to 65536 gray levels) |
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RGB color (24 bits per pixel or 16 Millions colors) |
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CMYK color (32 bits per pixel) |
Waaves compression keeps original image parameters.
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What graphical formats can I use with Waaves application ?
Waaves supports the main graphical formats as well as professional specific formats.
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BMP - ".bmp" extension ; |
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DICOM - ".dcm" extension (only for medical versions) ; |
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JPEG - ".jpg", ".jpeg"
or ".jpe" extension ; |
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PNG - ".png" extension ; |
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TARGA - ".tga" extension ; |
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TIFF - ".tiff", ".tif" extension ; |
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WAAVES - ".cod" extension. |
More specific formats can be added as options such as FITS or RAW formats (Please contact us for more information).
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How to view Waaves images (.cod extension) ?
Waaves Viewer
provided free of charge by CIRA as well as all our (products)
can display and print Waaves images.
CIRA also provides a viewer for mobile phones (see Mobility)
based on Symbian OS (version 6.x).
A plug-in for browser like Internet Explorer or FireFox will be soon available to display Waaves images
directly through web pages.
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Can I convert a Waaves image to another format ?
Yes.
You can easily export a Waaves image to another supported format to save it in a presentation for instance.
Waaves offers an export function to the following formats :
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BMP - ".bmp" extension ; |
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JPEG - ".jpg", ".jpeg"
or ".jpe" extension ; |
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PNG - ".png" extension ; |
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TARGA - ".tga" extension ; |
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TIFF - ".tiff", ".tif" extension ; |
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RAW – with no header - ".raw" extension. |
Do not forget that in that case the image will have the same weight as the original image.
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How to insert a Waaves image in a third-part application ?
You can easily export any Waaves image into most standard applications.
Simply insert your image in a document like Word or Excel
document by using the copy / paste functions.
In that case, the image will be stored as a bitmap in the host document.
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How to compress several images at the same time ?
Waaves 2.5 Professional (see products list ) provides
you with the opportunity to compress several images stored in a folder at the same time using a batch process.
This functionality enables you to compress to Waaves or export to another formats several images at the same time.
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Can I use Waaves for video ?
Waaves has been optimized for still image compression. Waaves Professional version
processes animated sequences (set of still images) and can display a short movie stored as a
set of still images.
This technology is used in the medical field for scanners, MRI and so on...
On the other hand, Waaves does not manage video streaming like mpeg. And there is no audio support
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