Unless someone knows of a more suitable module, you can try counting the IFD's (image file directories) directly. Here's some pseudocode to get you started. Sorry, I dont have time for more right now. You can google the TIFF spec for more info. 

read bytes 0,1 # Byte ordering: 4949 = intel,  4D4D = motorola

$imagecount = 0

$offset = read bytes 4-7 # first image directory

while $offset != 0

    $ifdlength = read first 2 bytes at $offset and multiply by 12

    $imagecount++

    $index = $offset + $ifdlength + 2

    $offset = read 4 bytes at $index

[download]

Update: math correction

In reply to Re: Multipage TIFFs by hangon
in thread Multipage TIFFs by oligmd

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.