How to interpret the value of a binary field within a file?

I opened a file in Notepad++.
The file has a field titled "Image Size" with a field type of Binary and is located in positions 47 - 50.
When I inspect this field via the VS2010 debugger, the values are as follows.
This field represents "Check Image Size". What would the value for the Image Size be based on the following positional  values within the field?

Position           Values

[46]                   0                    
[47]                   0
[48]                   53
[49]                   8