⚡ Bolt: Optimize image processing and fix RGBA resize crash #353
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- Replaced inefficient `Image.new()` + `paste()` with `img.info.clear()` to strip EXIF data without memory allocation. - Fixed a bug where resizing RGBA images caused a crash due to forcing JPEG format. - Added logic to preserve original image format or intelligently default based on image mode. - Applied changes to both `process_uploaded_image_sync` and `_validate_uploaded_file_sync`. Co-authored-by: RohanExploit <178623867+RohanExploit@users.noreply.github.com>
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🙏 Thank you for your contribution, @RohanExploit!PR Details:
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📝 WalkthroughWalkthroughThe PR modifies image processing logic in Changes
Estimated code review effort🎯 2 (Simple) | ⏱️ ~12 minutes Possibly related PRs
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Pull request overview
This PR updates the backend image upload pipeline to reduce memory/CPU overhead during metadata stripping and to prevent crashes when resizing RGBA (transparent) images by preserving the original image format for re-encoding.
Changes:
- Preserve the original PIL
img.formatbefore resize operations and use it to choose a safe save format (PNG for RGBA when needed). - Replace the EXIF-stripping “new image + paste” approach with clearing image metadata via
img.info.clear(). - Adjust save logic to avoid defaulting to JPEG when processing RGBA images.
Comments suppressed due to low confidence (1)
backend/utils.py:115
file.sizeis set fromoutput.tell()immediately afteroutput.seek(0), which will always set the size to 0. If any later logic relies onUploadFile.size, this breaks size checks/limits. Compute the size before rewinding the buffer (or uselen(output.getbuffer())) and then seek back to 0.
img.save(output, format=save_format, quality=85)
output.seek(0)
# Replace file content
file.file = output
file.size = output.tell()
output.seek(0)
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| # Strip EXIF | ||
| img_no_exif = Image.new(img.mode, img.size) | ||
| img_no_exif.paste(img) | ||
| # Optimization: Clear info dictionary instead of creating new image and pasting (avoids full copy) | ||
| if hasattr(img, 'info'): | ||
| img.info.clear() | ||
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| # Save to BytesIO | ||
| output = io.BytesIO() | ||
| # Preserve format or default to JPEG | ||
| fmt = img.format or 'JPEG' | ||
| img_no_exif.save(output, format=fmt, quality=85) | ||
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| # Preserve format or default to JPEG, handling RGBA edge case | ||
| save_format = original_format or ('PNG' if img.mode == 'RGBA' else 'JPEG') | ||
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| img.save(output, format=save_format, quality=85) |
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The PR description mentions verifying changes with tests/test_image_optimization.py, but that test file isn’t included in this PR. Since the EXIF-stripping and format-preserving resize behavior is security/behaviorally significant, please add/keep automated tests that cover (1) large RGBA PNG resize path and (2) metadata/EXIF removal, so regressions are caught.
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| img.save(output, format=save_format, quality=85) | ||
| output.seek(0) | ||
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After resizing, img is a new PIL object whose format is typically None. Even though you preserve original_format for saving back into file.file, you still return the resized img with img.format=None, which can later cause downstream code (e.g., helpers that default to JPEG when image.format is missing) to attempt JPEG encoding and crash again for RGBA images. Consider restoring img.format (and/or returning a reopened image from the resized bytes) so callers receive an image with a correct format.
| # Ensure the returned image reports the correct format | |
| img.format = save_format |
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⚠️ Outside diff range comments (1)
backend/utils.py (1)
110-115:⚠️ Potential issue | 🟡 MinorPre-existing bug:
file.sizeis set to 0 after resize.Not introduced by this PR, but since this code directly follows the new save logic: after
output.seek(0)on line 110,output.tell()on line 114 returns0. The intent was likely to capture the new file size. Also, line 115 is a redundant seek.Suggested fix
- output.seek(0) - # Replace file content file.file = output - file.size = output.tell() - output.seek(0) + file.size = output.getbuffer().nbytes + output.seek(0)
🧹 Nitpick comments (1)
backend/utils.py (1)
262-269: Inconsistent EXIF-stripping strategy:save_file_blockingstill usesImage.new() + paste().
process_uploaded_image_syncwas updated to useimg.info.clear()for efficiency, but this function retains the oldImage.new() + paste()approach. If the memory optimization matters here too, consider aligning the strategy. Otherwise, a comment explaining the intentional difference would help future readers.The format fallback on line 268 is correctly applied — consistent with the other paths.
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💡 What: Optimized
process_uploaded_image_syncand_validate_uploaded_file_syncinbackend/utils.py. Replaced the inefficientImage.new()+paste()method for stripping EXIF withimg.info.clear(), and implemented logic to preserve image format (or default to PNG for RGBA) during resizing.🎯 Why: The previous method for stripping EXIF allocated a new image and copied all pixels, doubling memory usage and CPU time for this step. Additionally, resizing RGBA images (PNGs) caused a crash because
img.formatwas lost and defaulted to 'JPEG', which doesn't support RGBA.📊 Impact: Reduces memory usage by ~50% during the EXIF stripping step for large images. Prevents 500 errors when users upload large transparent PNGs.
🔬 Measurement: Verified with
tests/test_image_optimization.py(temporary test) which confirmed correct EXIF stripping without copy and successful resizing of large RGBA PNGs.PR created automatically by Jules for task 6671053904282164411 started by @RohanExploit
Summary by CodeRabbit
Bug Fixes