$ zbarimg flag.png QR-Code:picoCTF{example_flag} scanned 1 barcode symbols from 1 images in 0 seconds $ zbarimg flag.png QR-Code:picoCTF{example_flag} scanned 1 barcode symbols from 1 images in 0 seconds $ zbarimg flag.png QR-Code:picoCTF{example_flag} scanned 1 barcode symbols from 1 images in 0 seconds # Check if inversion is the problem $ convert flag.png -negate inverted.png $ zbarimg inverted.png QR-Code:picoCTF{found_it} scanned 1 barcode symbols from 1 images in 0 seconds # Check if inversion is the problem $ convert flag.png -negate inverted.png $ zbarimg inverted.png QR-Code:picoCTF{found_it} scanned 1 barcode symbols from 1 images in 0 seconds # Check if inversion is the problem $ convert flag.png -negate inverted.png $ zbarimg inverted.png QR-Code:picoCTF{found_it} scanned 1 barcode symbols from 1 images in 0 seconds # Check dimensions first $ identify flag.png flag.png PNG 48x48 48x48+0+0 8-bit sRGB 1.2KB # Upscale — use point filter to keep edges sharp, not blurry $ convert flag.png -resize 400% -filter point upscaled.png $ zbarimg upscaled.png # Check dimensions first $ identify flag.png flag.png PNG 48x48 48x48+0+0 8-bit sRGB 1.2KB # Upscale — use point filter to keep edges sharp, not blurry $ convert flag.png -resize 400% -filter point upscaled.png $ zbarimg upscaled.png # Check dimensions first $ identify flag.png flag.png PNG 48x48 48x48+0+0 8-bit sRGB 1.2KB # Upscale — use point filter to keep edges sharp, not blurry $ convert flag.png -resize 400% -filter point upscaled.png $ zbarimg upscaled.png -filter point # Crop to the QR code region: width x height + x_offset + y_offset $ convert flag.png -crop 200x200+50+50 cropped.png $ zbarimg cropped.png # Crop to the QR code region: width x height + x_offset + y_offset $ convert flag.png -crop 200x200+50+50 cropped.png $ zbarimg cropped.png # Crop to the QR code region: width x height + x_offset + y_offset $ convert flag.png -crop 200x200+50+50 cropped.png $ zbarimg cropped.png # Extract one frame per second $ ffmpeg -i challenge.mp4 -vf fps=1 frame_%04d.png $ zbarimg frame_*.png # Extract one frame per second $ ffmpeg -i challenge.mp4 -vf fps=1 frame_%04d.png $ zbarimg frame_*.png # Extract one frame per second $ ffmpeg -i challenge.mp4 -vf fps=1 frame_%04d.png $ zbarimg frame_*.png # Step 1: Try directly zbarimg flag.png Step 2: Check if colors are inverted (look at the image — dark background?) convert flag.png -negate inverted.png && zbarimg inverted.png Step 3: Check resolution identify flag.png If small (under 100px), upscale: convert flag.png -resize 400% -filter point upscaled.png && zbarimg upscaled.png Step 4: Combine both fixes convert flag.png -negate -resize 400% -filter point fixed.png && zbarimg fixed.png # Step 1: Try directly zbarimg flag.png Step 2: Check if colors are inverted (look at the image — dark background?) convert flag.png -negate inverted.png && zbarimg inverted.png Step 3: Check resolution identify flag.png If small (under 100px), upscale: convert flag.png -resize 400% -filter point upscaled.png && zbarimg upscaled.png Step 4: Combine both fixes convert flag.png -negate -resize 400% -filter point fixed.png && zbarimg fixed.png # Step 1: Try directly zbarimg flag.png Step 2: Check if colors are inverted (look at the image — dark background?) convert flag.png -negate inverted.png && zbarimg inverted.png Step 3: Check resolution identify flag.png If small (under 100px), upscale: convert flag.png -resize 400% -filter point upscaled.png && zbarimg upscaled.png Step 4: Combine both fixes convert flag.png -negate -resize 400% -filter point fixed.png && zbarimg fixed.png - QR Code Inside a Video Frame