extract images from pdf using pdfbox

Question

I m trying to extract images from a pdf using pdfbox. The example pdf here

But i m getting blank images only.

The code i m trying:-

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Answer 1

This is a kotlin version of @Matt's answer.

fun  PDResources.onImageResources(block: (RenderedImage) -> (R)): List =
        this.xObjectNames.flatMap {
            when (val xObject = this.getXObject(it)) {
                is PDFormXObject -> xObject.resources.onImageResources(block)
                is PDImageXObject -> listOf(block(xObject.image))
                else -> emptyList()
            }
        }

You can use it on PDPage Resources like this:

page.resources.onImageResources { image ->
    Files.createTempFile("image", "xxx").also { path-> 
        if(!ImageIO.write(it, "xxx", file.toFile()))
            IllegalStateException("Couldn't write image to file")
    }
}

Where "xxx" is the format you need (like "jpeg")