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Documentation of class 'Depth64Image':

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Class: Depth64Image


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:

queries
o  defaultPhotometric
return the default photometric pixel interpretation

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


Instance protocol:

accessing-pixels
o  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)

o  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

initialization
o  initialize

queries
o  bitsPerPixel
return the number of bits per pixel

o  bitsPerRow
return the number of bits in one scanline of the image

o  bytesPerRow
return the number of bytes in one scanline of the image

o  hasAlphaChannel



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