A repo for small PDF utilities.


# Convert PDF RGB to only-Black

This will convert an RGB PDF (even if it appears only black) to `input-K.pdf`.


    ./color_convert.sh black input.pdf input-K.pdf        




# Convert PDF from RGB to CMYK 

Dependencies:

- `gs` (Ghostscript)
- `pdftops`

This will convert a PDF to `input-cmyk.pdf`.

Usage:

    ./rgb2cmyk.sh input.pdf
    
## Overprint

If you need overprint, This command will convert a PDF to `input-cmyk-op.pdf` :

    ./rgb2cmyk.sh input.pdf overprint


# Combine PDFs having different color modes

Dependencies:

- `gs` (Ghostscript)
- `pdftk` (for multistamp)

This will convert each input PDF file to the corresponding color mode (black, cmyk or spot color), then combine the resulting files on top of each other.

## Example


Overlaying a black PDF, a coloured PDF and a spot color PDF (this one is exported full-black and is colored by the script):

	./color_convert.sh black,cmyk,spot-PANTONE 705 U-0.9 0.1 0.5 0.1 input_layer1.pdf,input_layer2.pdf,input_layer3.pdf output.pdf




# Check color separations

Dependencies:

- `gs` (Ghostscript)
- `magick` ([ImageMagick](https://www.imagemagick.org/))

This makes black and white images of each CMYK plates and makes a small
HTML page to preview the plates. It will output blank plates if your PDF is in
RGB.

Usage:

    ./colorSeparation.sh input-cmyk.pdf


Web interface for coloured preview of each plate:

![all](http://osp.constantvzw.org/api/osp.tools.PDFutils/bf1d20aadcbc417dbcbf9b7d2ffbfb1f63aa4339/blob-data/all.png)
![cyan](http://osp.constantvzw.org/api/osp.tools.PDFutils/51ee03bb8883e56147b50dade2fadef0e577f2bb/blob-data/cyan.png)
![magenta](http://osp.constantvzw.org/api/osp.tools.PDFutils/ebf3c97f5a70c3f44a491bd636cff9d3fa426398/blob-data/magenta.png)
![yellow](http://osp.constantvzw.org/api/osp.tools.PDFutils/46ed17c0e192bdca1781b79665c8b3c1806b3fd8/blob-data/yellow.png)
![black](http://osp.constantvzw.org/api/osp.tools.PDFutils/8eb6ff8fa341701b3443ad665929e21640a8ba42/blob-data/black.png)

By zooming out, you can see several pages at the same time:
![](many pages]http://osp.constantvzw.org/api/osp.tools.PDFutils/628a1a1eb8067a46be8cc6d7680bb7fa2e7144f7/blob-data/many-pages.png)