Class: Depth64Image

• Inheritance
• Description
• Related information
• Class protocol
  • queries
• Instance protocol
  • accessing-pixels
  • initialization
  • queries

Inheritance:

   Object
   |
   +--Image
      |
      +--Depth64Image

Package:

stx:libview

Category:

Graphics-Images

Version:

rev: 1.12 date: 2017/10/12 14:50:10

user: cg

file: Depth64Image.st directory: libview

module: stx stc-classLibrary: libview

Author:

Claus Gittinger

Description:

this class represents 64 bit images as possibly provided by png 4x16bit rgba images.
Such images are normally not used in real world applications, as humans cannot differentiate 
more than roughly 200 distinct color tone values. However, in image processing (false-color) applications,
such a fine grain image makes sense and is sometimes used.

For now, the rest of the system (for example, the image editor) cannot reallydeal with
such images. So some work may be required in the future.

Related information:

    Depth1Image
    Depth2Image
    Depth4Image
    Depth8Image
    Depth16Image
    Depth24Image
    Depth32Image
    ImageReader

Class protocol:

 defaultPhotometric

return the default photometric pixel interpretation

 imageDepth

return the depth of images represented by instances of
this class - here we return 64

Instance protocol:

 pixelAtX: x y: y

retrieve a pixel at x/y; return a pixelValue.
The interpretation of the returned value depends on the photometric
and the colormap. See also Image>>atX:y:)
Pixels start at x=0 , y=0 for upper left pixel, end at
x = width-1, y=height-1 for lower right pixel.
The pixel value contains r/g/b/a in msb order (i.e. r at high, a at low bits)

 pixelAtX: x y: y put: aPixelValue

set the pixel at x/y to aPixelValue.
The interpretation of the pixelValue depends on the photometric
and the colormap. (see also: Image>>atX:y:put:)
Pixels start at x=0 , y=0 for upper left pixel, end at
x = width-1, y=height-1 for lower right pixel

 initialize

 bitsPerPixel

return the number of bits per pixel

 bitsPerRow

return the number of bits in one scanline of the image

 bytesPerRow

return the number of bytes in one scanline of the image

 hasAlphaChannel