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Fix CLI encode format detection and jpegtran -trim bug

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CLI encode:
- Auto-detect output format from extension (.jpg → DCT mode, .png → LSB)
- Default to JPEG output for JPEG carriers (preserves DCT benefits)
- Pass embed_mode and dct_output_format to encode function

jpegtran fix (critical for rotation fallback):
- Remove -trim flag which was dropping edge blocks and destroying stego data
- Remove -perfect flag which fails on non-MCU-aligned images
- Plain jpegtran without flags works correctly for lossless rotation

This enables: encode → external rotation → decode to work correctly.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
This commit is contained in:
Aaron D. Lee
2026-01-11 17:06:53 -05:00
parent 38bef32750
commit afc8c93923
3 changed files with 25 additions and 17 deletions
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6
frontends/web/app.py
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@@ -2136,7 +2136,7 @@ def api_tools_rotate():
output_path = tempfile.mktemp(suffix=".jpg")
try:
result = subprocess.run(
["jpegtran", "-rotate", str(rotation), "-copy", "all", "-trim",
["jpegtran", "-rotate", str(rotation), "-copy", "all",
"-outfile", output_path, input_path],
capture_output=True, timeout=30
)
@@ -2158,7 +2158,7 @@ def api_tools_rotate():
output_path = tempfile.mktemp(suffix=".jpg")
try:
result = subprocess.run(
["jpegtran", "-flip", "horizontal", "-copy", "all", "-trim",
["jpegtran", "-flip", "horizontal", "-copy", "all",
"-outfile", output_path, input_path],
capture_output=True, timeout=30
)
@@ -2180,7 +2180,7 @@ def api_tools_rotate():
output_path = tempfile.mktemp(suffix=".jpg")
try:
result = subprocess.run(
["jpegtran", "-flip", "vertical", "-copy", "all", "-trim",
["jpegtran", "-flip", "vertical", "-copy", "all",
"-outfile", output_path, input_path],
capture_output=True, timeout=30
)