Identified Images cannot be converted to image due to invalid (?) content

[delovelady]

PLEASE HELP ME CANCEL/CLOSE THIS ISSUE

My original search was incorrect, and this is a duplicate (times about 10).

In this file, 18 images are identified. But the following code cannot convert any images:

$pdf = $parser->parseFile($pdfFile) ;
$images = $pdf->getObjectsByType('XObject', 'Image') ;
foreach ($images AS $imgKey => $pdfImage) {
    try {
        $image = @imagecreatefromstring($pdfImage->getContent()) ;
    } catch (Exception $e) {
        $image = false ;
    }
    if ($image)
        printf("Image[$imgKey] converted.\n") ;
    else
        printf("Image[$imgKey] could not be converted.\n") ;
}

The encoding here seems to be 'FlateDecode' for all images in this file. I did not find any help to lead me to believe this should not work. Is my approach incorrect?

[PrinsFrank]

I'm able to extract 125 images with v2.2.0 of prinsfrank/pdfparser: https://github.com/PrinsFrank/pdfparser/releases/tag/v2.2.0

The images that are stored with FlateDecode are rasterized images and need to be constructed based on bits_per_component and number of components (1, 3 or 4).