Aiko: PDF-Image Extractor
Compiling:
	From CMD: compile
	From Powershell: .\compile
	From Linux shell: ./compile.sh
Usage:
	From CMD: Aiko <pdf>.pdf <page> <dpi>
	From Powershell: .\Aiko <pdf>.pdf <page> <dpi>
	From Linux shell ./Aiko.sh <pdf>.pdf <page> <dpi>
Page number intervals (e.g. 21-22) can be included, or "all" to extract all images. Keep in mind, page numbers start from 0.
Default DPI is 72, a good balance for very high quality is 300. (TODO verify this is true): If the PDF file contains embedded images, leaving DPI unspecified will output original quality.
Include extra argument -d to disable lossless PNG optimization (faster, but much larger PNGs).
If you get a "JNI error," upgrade your Java >= 1.9. 
If you don't have "javac," you need to install the JDK (>= 1.9).