iText 7 sample
Preserve the embedded image
Sometimes you want to crop part of the image and add it to the PDF. If you use BufferedImage to manipulate the input images, some information will be lost. For example, exif or color profiles.
To keep the original image file untouched, you could crop the image by using PdfFormXObject. Then add the object to a PDFCanvas.
Spot color
In order to create a spot color in iText, we need to bind an alternate color space to the spot color (Separation).
Example here https://github.com/leoleozhu/itext-sample/blob/master/src/test/java/com/leoleozhu/itextcolor/SpotColorTest.java#L32
Add image with mask
iText has already provided an example for this topic. But if you apply a mask to a transparent image, you get blacked image.
The reason is that:
- When you create ImageData with
imageData = ImageDataFactory.create, there is already a mask image inimageData.getImageMask() - When you apply image mask with
imageData.setImageMask(maskData);, the original image mask got replaced.
In order to correctly place an extra mask on the transparent image, you could combine both the original loaded image mask and the new one.
Example here https://github.com/leoleozhu/itext-sample/blob/master/src/test/java/com/leoleozhu/itextimage/ImageMaskTest.java#L87
The mask creation is not very fast. There could be better solutions for this use case.