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Skip empty page detection if optional bc not available

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This commit is contained in:
Raman Gupta 2021-07-30 12:48:20 -04:00
parent ded351edf4
commit 45cf51f9e8
2 changed files with 11 additions and 6 deletions
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5
scan
View File

@ -242,6 +242,11 @@ if [[ $DESKEW == 1 ]]; then
DESKEW="--swdeskew=yes"
fi
if [[ $SKIP_EMPTY_PAGES == 1 && ! -x "$(command -v bc)" ]]; then
echo >&2 'Warning: `--skip-empty-pages` specified, but `bc` not available. Disabling empty page detection.'
SKIP_EMPTY_PAGES=0
fi
export VERBOSE
export UNPAPER
export SEARCHABLE

12
scan_perpage
View File

@ -67,10 +67,10 @@ fi
process_page() {
log ""
log "-------------------------------------------------------------------------------"
log "Post-processing scanned page ${IMAGE_PATH}, deskew=$UNPAPER, searchable=$SEARCHABLE..."
log "Post-processing scanned page ${IMAGE_PATH}, deskew=$UNPAPER, searchable=$SEARCHABLE, skip-empty-pages=$SKIP_EMPTY_PAGES..."
log "-------------------------------------------------------------------------------"
if [[ $SKIP_EMPTY_PAGES -eq 1 ]]; then
if [[ $SKIP_EMPTY_PAGES == 1 ]]; then
PERCENTAGE_WHITE=$(convert "$IMAGE_PATH" -fuzz 0% -negate -threshold 0 -negate -format "%[fx:100*mean]" info:) || PERCENTAGE_WHITE=0
log "$IMAGE_PATH has $PERCENTAGE_WHITE % white"
else
@ -78,7 +78,9 @@ process_page() {
fi
PP_PREFIX=
if (( $(echo "$PERCENTAGE_WHITE < 99.8" | bc -l) )); then
if [[ $SKIP_EMPTY_PAGES == 1 && $(echo "$PERCENTAGE_WHITE > 99.8" | bc -l) == 1 ]]; then
log "Skipping empty page $IMAGE_FILE with white percentage $PERCENTAGE_WHITE"
else
if [[ $UNPAPER == 1 ]]; then
log "Applying unpaper post-processing to image data..."
PP_PREFIX="unpaper-"
@ -105,7 +107,7 @@ process_page() {
fi
PNMVERBOSE=
# older versions of pnmtops (Ubuntu, Debian) don't have the -verbose option, test for it
if [[ $VERBOSE = 1 && ! "$(pnmtops -verbose 2>&1 < /dev/null)" =~ "unrecognized option" ]]; then
if [[ $VERBOSE == 1 && ! "$(pnmtops -verbose 2>&1 < /dev/null)" =~ "unrecognized option" ]]; then
PNMVERBOSE="-verbose"
fi
log "...Running pnmtops on $IMAGE_DIR/$PP_PREFIX$IMAGE_FILE using page options: $PAGEOPTS"
@ -114,8 +116,6 @@ process_page() {
runconstrained $TIMEVERBOSE ps2pdf $PS2PDF_OPTS $IMAGE_DIR/${IMAGE_FILE}.ps $IMAGE_DIR/${IMAGE_FILE}.pdf | logstdout
[[ -f $IMAGE_DIR/${IMAGE_FILE}.ps ]] && rm $IMAGE_DIR/$PP_PREFIX${IMAGE_FILE}.ps
fi
else
log "Skipping empty page $IMAGE_FILE with white percentage $PERCENTAGE_WHITE"
fi
status=$?