Rename processed TIFF output file and add page number if needed (fixes issue #3544)

Signed-off-by: NStefan Weil <sw@weilnetz.de>

doc/tesseract.1.asc

@@ -107,7 +107,7 @@ OPTIONS
   * *pdf* -- Output PDF ('OUTPUTBASE'`.pdf`).
   * *tsv* -- Output TSV ('OUTPUTBASE'`.tsv`).
   * *txt* -- Output plain text ('OUTPUTBASE'`.txt`).
-  * *get.images* -- Write processed input images to file (`tessinput.tif`).
+  * *get.images* -- Write processed input images to file ('OUTPUTBASE'`.processedPAGENUMBER.tif`).
   * *logfile* -- Redirect debug messages to file (`tesseract.log`).
   * *lstm.train* -- Output files used by LSTM training ('OUTPUTBASE'`.lstmf`).
   * *makebox* -- Write box file ('OUTPUTBASE'`.box`).

src/api/baseapi.cpp

@@ -1276,7 +1276,12 @@ bool TessBaseAPI::ProcessPage(Pix *pix, int page_index, const char *filename,
 
   if (tesseract_->tessedit_write_images) {
     Pix *page_pix = GetThresholdedImage();
-    pixWrite("tessinput.tif", page_pix, IFF_TIFF_G4);
+    std::string output_filename = output_file_ + ".processed";
+    if (page_index > 0) {
+      output_filename += std::to_string(page_index);
+    }
+    output_filename += ".tif";
+    pixWrite(output_filename.c_str(), page_pix, IFF_TIFF_G4);
   }
 
   if (failed && retry_config != nullptr && retry_config[0] != '\0') {