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# Description of Changes
* Transparency Fix: Implemented a pre-processing step that adds an
opaque white background to pages before conversion. This ensures that
transparent elements are correctly
flattened against white rather than defaulting to black (a common issue
in Ghostscript flattening).
* Color Distortion Fix: Removed a misconfigured -sDefaultCMYKProfile
setting in the Ghostscript command that was incorrectly pointing to an
RGB profile. This resolves the
"dark/black" color corruption previously seen in print-ready CMYK PDFs.
* PDF/A Compliance Improvements:
* Font Handling: Updated fixType1FontCharSet to only add a standard
CharSet if it is missing or empty. This prevents validation errors where
subsetted fonts were being forced
to declare glyphs they did not contain.
* Spot Color Unification: Added fixSeparationColorSpaces to detect and
unify TintTransform objects for Separation colors with the same colorant
name, ensuring consistency
across document resources.
* OCG Naming: Ensured all Optional Content Groups have a valid Name
entry.
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Please provide a summary of the changes, including:
- What was changed
- Why the change was made
- Any challenges encountered
Closes #(issue_number)
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## Checklist
### General
- [X] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [X] I have read the [Stirling-PDF Developer
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/DeveloperGuide.md)
(if applicable)
- [ ] I have read the [How to add new languages to
Stirling-PDF](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/HowToAddNewLanguage.md)
(if applicable)
- [X] I have performed a self-review of my own code
- [X] My changes generate no new warnings
### Documentation
- [ ] I have updated relevant docs on [Stirling-PDF's doc
repo](https://github.com/Stirling-Tools/Stirling-Tools.github.io/blob/main/docs/)
(if functionality has heavily changed)
- [ ] I have read the section [Add New Translation
Tags](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/HowToAddNewLanguage.md#add-new-translation-tags)
(for new translation tags only)
### Translations (if applicable)
- [ ] I ran
[`scripts/counter_translation.py`](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/docs/counter_translation.md)
### UI Changes (if applicable)
- [ ] Screenshots or videos demonstrating the UI changes are attached
(e.g., as comments or direct attachments in the PR)
### Testing (if applicable)
- [X] I have tested my changes locally. Refer to the [Testing
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/DeveloperGuide.md#6-testing)
for more details.
---------
Signed-off-by: Balázs Szücs <bszucs1209@gmail.com>
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