Concerning extracting the size info of the image-CodePudding

I am trying to extract the dimension size info of the image with GetSize() and Get3DSize() as follows:

try { 2DData.Get3DSize (sizeX, sizeY, sizeZ); }
catch { 2DData.GetSize (sizeX, sizeY); Break; } 
OKDialog ("Size in Z direction ="  sizeZ)

For 2D data, Get3DSize() apparently does not work and the stuff within catch() will be executed to catch this error. Strange is that the size in the Z direction can still be extracted and it is 1. What happens here?

CodePudding user response：

GMS will internally use dimension size 1 for "non-existing" dimensions.

GetSize() and Get3DSize() are only old convenience "shorthand" commands. I would recommend using:

ImageGetDimensionSize() to access a specific dimensions.
ImageGetNumDimensions() to query the number of existing dimensions.
ImageGetDimensionSizes() to read multiple dimensions at once, f.e. to compute the number of values in an image. That's where "1" comes in handy.

    image test := realImage("",4,100)
//    image test := realImage("",4,10,20)
//    image test := realImage("",4,10,20,30)
    number x,y,z
    test.ImageGetDimensionSizes(x,y)
    result("\n x=" x)
    result("\n y=" y)
    test.ImageGetDimensionSizes(x,y,z)
    result("\n x=" x)
    result("\n y=" y)
    result("\n z=" z)
    result("\n # values:" (x*y*z))