Extracting RGB values from a TIFF using VB

I am developing an application in VB 6.0 to analyze TIFF files. When extracting the R, G, B value (byte) for each pixel, occasionally the returned value is not what is expected when compared to that of photoshop. e.g. the photoshop gives Red = 252 but the value I application extracts is 0 or 1.

I have tried to capture the info in two ways:

1. Using FileSystemObject along with TextStream and Read

2. Using Open with Get

But unfortunately neither of them is working out for me here.

Can anyone tell me whats wrong and how do I go about it??