Re: photometric value different when get from TIFF tag or from a TIFFRGBAImage
On Thu, Jan 5, 2017 at 8:55 PM, Olivier Paquet <[hidden email]> wrote:
> 2017-01-05 14:30 GMT-05:00 Vincent Torri <[hidden email]>:
>> I have attached a small test program which displays the photometric
>> value of an attached TIFF file
>> from TIFFRGBAImage : value is 2
>> from TIFF tag, value is 32845
>> from TIFFPrintDirectory() (which uses TIFF flag ?) it is also 32845
>> Is it normal or is it a bug ?
> I think it is normal. Your file is LogLuv but the RGBA API converts it to
> RGB for you. The man page of TIFFRGBAImageBegin mentions that.
ha, ok, it seems normal, indeed
>> which value should I choose in case there is no bug ?
> It depends what you need the value for. To interpret the data you get from
> the RGBA API, 2 (RGB) should be the correct value.
I am writing a multi-document viewer and i'm writing a plugin for TIFF
files with multiple directories. I want to display the informations of
the TIFF file (and directories too).
So I will use the tags