[PDFBOX-3981] It won't catch the exception when read the CMYK image in PDF for DCTFilter.class

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Incomplete
• Affects Version/s: 2.0.7
• Labels: cmyk
• Environment: Windows/Liunx
• Assignee: Unassigned
• Reporter: austinchen
• Created: 26/Oct/17 15:39
• Updated: 28/Oct/17 08:41
• Resolved: 28/Oct/17 08:41

Description

In below code of DCTFilter.class, can't catch the IIOException because the right Exception is IOException.

And when I change the code, in my testing, when I convert the PDF to image, I found the CMYK image will be lost in converted image, it's very strange when I set "String numChannels = '2'", I got positive result.

            if ("3".equals(numChannels) || numChannels.isEmpty())
            {
                try
                {
                    // I'd like to use ImageReader#readRaster but it is buggy and can't read RGB correctly
                    BufferedImage image = reader.read(0);
                    raster = image.getRaster();
                }
                catch (IIOException e)
                {
                    // JAI can't read CMYK JPEGs using ImageReader#read or ImageIO.read but
                    // fortunately ImageReader#readRaster isn't buggy when reading 4-channel files
                    raster = reader.readRaster(0, null);
                }
            }