Correct token count for GPT-4v images

[BeibinLi]

Why are these changes needed?

Related issue number

Checks

• [X] I've included any doc changes needed for https://microsoft.github.io/autogen/. See https://microsoft.github.io/autogen/docs/Contribute#documentation to build and test documentation locally.
• [X] I've added tests (if relevant) corresponding to the changes introduced in this PR.
• [X] I've made sure all auto checks have passed.

[afourney]

Looks good, but have you tested these numbers with the OpenAI token calculator they publish? I'm imagining there are some subtleties to confirm (e.g., any tile overlap?)

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 17.64706% with 28 lines in your changes missing coverage. Please review.

Project coverage is 18.29%. Comparing base (6279247) to head (4a8a423). Report is 10 commits behind head on main.

Files	Patch %	Lines
autogen/token_count_utils.py	20.00%	16 Missing :warning:
autogen/agentchat/contrib/img_utils.py	14.28%	12 Missing :warning:

:exclamation: There is a different number of reports uploaded between BASE (6279247) and HEAD (4a8a423). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (6279247)	HEAD (4a8a423)
unittests	2	1

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2420       +/-   ##
===========================================
- Coverage   32.90%   18.29%   -14.61%     
===========================================
  Files          94       95        +1     
  Lines       10235    10444      +209     
  Branches     2193     2197        +4     
===========================================
- Hits         3368     1911     -1457     
- Misses       6580     8415     +1835     
+ Partials      287      118      -169     

Flag	Coverage Δ
unittests	18.29% <17.64%> (-14.61%)	:arrow_down:

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[julie2025]

Hi everyone, I'm having an issue with the token count in MultimodalConversableAgent. It seems to be including the base64 encoded image URL when estimating the number of tokens and cost, which is incorrect. Does anyone have any suggestions on how to fix this?

Thanks in advance.