How to check the TIFF type?

[IlyaRabyy]

Colleagues,
Not sure this is the place for this question, but I dunno where else...
I hope you're all familiar with the TIFF image file format.
TIFF may store raster image of bilevel (B&W) format, grayscale format, or color (palette or full RGB).
It can also have this image info As-Is, or compressed (LZW or ZIP).
Here's the question:
Is there a way to programmatically extract this above information from a TIFF file on disk? E.g. - B&W or RGB? Compressed oar not?

TIA!


Regards,

Ilya

 

[Andrzejek]

You may want to Google something like "vb net tiff file attributes"

This is one of the hits I've got. Looks interesting...

---- Andy

"Hmm...they have the internet on computers now"--Homer Simpson

 

[IlyaRabyy]

I ran search for "TIFF file header" - nothing useful came back.
The one you've provided does look promising - thank you!

But!
To try it requires downloading and installing and registering an OCX - which policy of the company I work for forbids. :-(

Actually, I was hoping to find the info on where these TIFF file attributes (e.g. color scheme and compression type and ratio) are stored in the file itself, so I could extract it.
Any idea on how-to?

Regards,

Ilya

 

[strongm]

A System.Drawing.Bitmap contains the following properties:

PropertyIDList

which contains a list of 'well-known' image property IDs. Ypu need to match the ID to a proper string. The TIFF IDs are documented by Adobe in

https://www.adobe.io/content/dam/udp/en/open/standards/tiff/TIFF6.pdf

(check the appendix)

PrropertyItems

which is a collection of ProprtyItems; a ProprtyItem maps the ID to an ac tual value - but not directly - it contains the ID, the the length (in bytes) of the Value, the types of the value, and the value itself - you need to determine the type, and then interpret the raw Value as that type ... (the types are outlined here:

https://docs.microsoft.com/en-us/do...g.propertyitem.type?view=dotnet-plat-ext-5.0)

Good luck ...

Of course one question would be - why do you need this TIFF metadata?