13–13 -optimize: Optimizing PDF Files

13–13–1 Processing

Optimizes PDF files.

"Optimization" here refers to image downsampling, removing open action, outlines, annotations, articles, thumbnails and merging fonts, etc.

13–13–2 Example of commands

[Executing example commands]

Downsamples the images in test.pdf, removes all annotations, and output as out.pdf.

[Windows]

AHPDFToolCmd80.exe -optimize -optimizeImage true -removeAnnots true -d C:\test\test.pdf -o C:\sav\out.pdf

[Linux]

AHPDFToolCmd80 -optimize -optimizeImage true -removeAnnots true -d /home/antenna/test/test.pdf -o /home/antenna/sav/out.pdf

13–13–3 Folder settings: applied

You can perform batch processing by specifying the input folder to the -d parameter and the output folder to the -o parameter. If a folder is specified, optimization processing will be performed on the PDF files in the input folder. Note that the output file will be output to the output folder with the same name as the input file name.

13–13–4 Parameters

Parameter	Content
-optimizeImage Val	Performs image downsampling processing(*1). Can be omitted. true: yes false: no If omitted, downsampling will not be performed. Downsampling is done with the following settings: ・Bicubic method ・Color/grayscale image: If the resolution is 225dpi or higher, it will be reduced to 150dpi. ・Black and white images: If the resolution is 450dpi or higher, it will be reduced to 300dpi.
-removeOpenAction Val	Removes open actions. Can be omitted. true: yes false: no If omitted, it will not be deleted.
-removeOutlines Val	Removes outlines. Can be omitted. true: yes false: no If omitted, it will not be deleted.
-removeAnnots Val	Removes annotations. Can be omitted. true: yes false: no If omitted, it will not be deleted.
-removeArticles Val	Removes articles. Can be omitted. true: yes false: no If omitted, it will not be deleted.
-removeThumbnails Val	Removes thumbnails. Can be omitted. true: yes false: no If omitted, it will not be removed.
-mergeFonts Val	Merges fonts (*2). Can be omitted. true: yes false: no If omitted, fonts will not be merges.

(*1) When downsampling is performed, the color space may differ from the original PDF data.
(*2) When you merge fonts, only embedded fonts are merged.
- The formats that can be integrated are TrueType, Type1 (CFF format only), CIDFontType2, and CIDFontType0.
- Even if the font type is the same, if the Font dictionary values (Ascent, CapHeight, etc.) are different, they will not be merged.
- TrueType fonts and CIDFontType2 fonts are subject to be merge only if the cmap, head, hhea, hmtx, maxp, cvt, fpgm, and prep tables are the same.