Let LEADTOOLS create a palette that is optimized
for the particular image. (As an option, this palette can include the
system identity palette.)Color Conversion
Standard Support
LEADTOOLS includes functions with many options for the flexibility necessary to make images look as good as possible, whether they are medical images, scanned documents or digital photographs. To help you provide the correct color depth for the hardware your clients are using, LEADTOOLS can convert images from any color resolution to any other color resolution, from 1-bit to 32-bit, with multiple dithering methods using various palette options.
Programmers can choose from 8 different dithering methods including Floyd Stein, Burkes, Ordered dithering, Color reduction, Stucki, Stephens, Sierra and Jarvis. Flexible palette options include LEAD's fixed palette, an auto-optimized palette, or a user defined palette. Images can be separated and/or reconstructed to/from individual RGB, CMYK, CMY, HSV, YUV and HSL color planes. When working with 12 and 16 bit grayscale images, LEADTOOLS' window leveling allows you to select the desired range of bits to be used for display or processing. (available in the LEADTOOLS Medical Imaging) All of these options give you the flexibility to make your images look just right for your application, whether you are working with medical images, scanned documents or digital photographs.
Images that are less than 16 bits per pixel require a palette (an array of color values). If an image file is less than 16 bits per pixel, the file contains a palette and when you load the image into a bitmap, the palette is also loaded into the bitmap handle. The value of each pixel in one of these images is an index into the palette. The number of colors in a palette is limited to the highest possible index value. For example, if an image is 8 bits per pixel, it can have a palette of 256 colors, which is the number of different colors that can be referenced by using the pixel values as 8-bit indexes.
Images that are 16 bits per pixel or higher store the color values directly in the image as pixel values. If you reduce a bitmap to less than 16 bits per pixel, a palette must be specified or created. You can do any of the following:
Let LEADTOOLS create a palette that is optimized
for the particular image. (As an option, this palette can include the
system identity palette.)
Specify a fixed palette, which is the same
for all images that use it. The palette can be LEAD's fixed palette or
the Netscape fixed palette.
Specify a palette of any size that you have
created. In creating your own palette, you can let LEADTOOLS do part of
the work. For example, you can fill in part of the palette, and let LEADTOOLS
fill the rest with optimized colors.
Modify the colors in the bitmap palette.
Copy a palette from a device context.
[DLL only] Use a table to increase the efficiency
of the palette that you define.
[Medical only] Use window leveling to map
grayscale intensities by specifying the bit range and/or a user defined
color map.
The LEADTOOLS Standard Color Conversion features are available in the following products:
LEADTOOLS Document Imaging Suite
LEADTOOLS Medical Imaging Suite
LEADTOOLS Raster Imaging Pro for .NET
Support for the Standard Color Conversion features is provided for the following programming interfaces:
ActiveX
API
Class Library
COM
.NET
VCL
Advanced Support
The LEADTOOLS Advanced Color Conversion features provide support for additional color spaces and the ability to use ICC color conversion profiles, Emulation Tables and LEAD's Built-in Conversion. Support is provided for conversions among RGB, BGR, YUV, CMYK, HSV, HLS, YIQ, CMY, LAB, YCCK, Y41P, UYVY, YUY2, YVU9, and YCC color spaces. Conversions can be performed either directly or indirectly.
The LEADTOOLS Advanced Color Conversion features provide emulation tables as one of the conversion methods when performing any of the following conversions:
CMYK to RGB
CIELab to RGB
RGB to CIELab
The LEADTOOLS Advanced Color Conversion features are available in the following products:
LEADTOOLS Document Imaging Suite
LEADTOOLS Medical Imaging Suite
Support for the Advanced Color Conversion features is provided for the following programming interfaces:
API