Update: As of version v2019R1, cmykProfile.jar is now packaged inside Qoppa’s library jars and no longer requires to be added to the classpath. When rendering or optimizing images with a CMYK color space (DeviceCMYK), Qoppa’s PDF libraries and components need the cmykProfile.jar to be present in the classpath. If you forget to include this jar, […]
Articles Tagged: color space
Export PDF to PNG Image with Overprint Simulation
This Java sample below shows how to use Qoppa’s jPDFImages (or jPDFProcess) to load a PDF and export it to an image in PNG format with overprint simulation on. First, the image is rendered in CMYK profile, then converted to RGB using ColorConvertOp and finally saved as PNG (or JPEG). The resolution is set at […]
LittleCMS “Cannot get color transform” with Java 8
When processing images with embedded color profiles (ICC) in Java, there is a bug that causes colors to be interpreted incorrectly when running with Java 8 (and some versions of OpenJDK7) . This issue is occurring because the color management module (CMM) was switched from Sun/Kodak’s legacy CMM to the more up-to-date and open-source LittleCMS in Java 8. […]
Export PDF Page as Image using CMYK or Custom Color Space
In version v2105R1, a new feature was added to our PDF to Image Conversion Library, jPDFImages, that allows rendering a page in a PDF document to CMYK color space or to any custom color space. Previous versions of the library would only render to the RGB color space which is typical when rendering to a […]
Rendering to CMYK and Overprint Simulation
In version v2015R1, Overprint simulation was added to Qoppa’s Java PDF component jPDFEditor. This advance PDF technique is used by professionals in the print and pre-press industry. Overprint simulation allows to preview how two distinct colors that overlap will mix when printed. RGB Rendering By default, Qoppa renders to RGB: To render to CMYK […]
Optimizing images in a PDF document: compression, color space and resolution
Qoppa’s 100% Java PDF optimizer library, jPDFOptimizer, allows, among other things, to change the properties of images in a PDF document including the compression, the color space, and the DPI resolution. This is done using the ImageHandler interface and implementing the convertImage() method which allows an application to define optimization option per image or per […]
