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2008.09.07 23:18 "[Tiff] SAMPLEFORMAT_IEEEFP", by acanicio
2008.09.11 20:13 "RE: [Tiff] SAMPLEFORMAT_IEEEFP", by Charles Auer
2008.09.12 20:57 "RE: [Tiff] SAMPLEFORMAT_IEEEFP", by acanicio
[...]

2008.09.12 20:57 "RE: [Tiff] SAMPLEFORMAT_IEEEFP", by acanicio

Thank you for the test files.

Concerning my problems with SMinSampleValue and SMaxSampleValue, I just found this: http://www.asmail.be/msg0055048683.html

I Use libtiffdelphi, and the above discussion exactly describes my problem with these tags.

I tried the solution on the XResolution and YResolution tags and it works. The TIFF RATIONAL values can be read and written correctly if they come from a Double variable.

For example this does not work:

Procedure Writetag(OpenTiff: PTIFF);
Begin
    TIFFSetField(OpenTiff,TIFFTAG_XRESOLUTION,300);
End;

But this works!

Procedure Writetag(OpenTiff: PTIFF);
Var value: Double;
Begin
   value := 300;
   TIFFSetField(OpenTiff,TIFFTAG_XRESOLUTION,Value);
End;

However with SMINSAMPLEVALUE and SMAXSAMPLEVALUE, none of these work:

Procedure Writetag(OpenTiff: PTIFF);
Begin
    TIFFSetField(OpenTiff,TIFFTAG_SMAXSAMPLEVALUE,1.0,1.0,1.0);
End;

Procedure Writetag(OpenTiff: PTIFF);
Var value: Double;
Begin
   value := 1;
   TIFFSetField(OpenTiff,TIFFTAG_SMAXSAMPLEVALUE,Value,Value,Value);
End;

Procedure Writetag(OpenTiff: PTIFF);
Var value: Single;
Begin
   value := 1;
   TIFFSetField(OpenTiff,TIFFTAG_SMAXSAMPLEVALUE,Value,Value,Value);
End;

Procedure Writetag(OpenTiff: PTIFF);
Var value: Real;
Begin
   value := 1;
   TIFFSetField(OpenTiff,TIFFTAG_SMAXSAMPLEVALUE,Value,Value,Value);
End;

Procedure Writetag(OpenTiff: PTIFF);
Var value: Extended;
Begin
   value := 1;
   TIFFSetField(OpenTiff,TIFFTAG_SMAXSAMPLEVALUE,Value,Value,Value);
End;

Does anybody have any other hint?

Thank you again

Best regards
Axel

I constructed some floating point test files. Sample values are between 0 and 1.

http://www.newviewgraphics.com/tiff/fptiff.zip (88kb)

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