Flattening by its very definition is removing transparency. Why do you want/need to flatten the image?
If for instance, a dogmatic or ill-equipped printer is demanding flattened files, the flattening should be done when you export a PDF from InDesign, by using the PDF/X-1a setting, but an unflattened, PDF/X4a is better for modern workflows.
Hi Danny, thanks for your reply. The thing is, when I export my file to pdf 2001 from indesign, this one image does not show correctly. I have made files with images in it that have transparency and never had any problems, but that is probably because that where png files...
When I export using the high quality print preset my image does show! But I need to save in pdf 2001.....
In what way is it showing incorrectly? Screenshots would help, of the Indesign document with and without 'Overprint Preview' switch on, and the exported PDF.
Are there any spot colours in your document, and if so, will they be printed as spot colours? Transparent images over spot colours are flattened in a particular way, using overprint settings, so that they might not display properly if 'Simulate Overprinting' isn't switched on in Acrobat, or in other PDF viewers. If your job won't be printed with spot colour inks, don't use them.
And are you required to use PDF/X-1a:2001, rather than PDF/X-4:2008?
Yes, my printing office requires PDF/X-1a:2001....
Herewith a screenshot of the page that has the image that gives problems. The below white image should be a picture of bedding without a background. I thought using PDF/X-1a:2001 would make sure images with transparencies would be displayed correctly, but apparently not....
I have used colors from my Pantone Uncoated Colorbook.
The image is a 1 layered psd file.
Looks like that turquoise is a a spot colour. Which PDF viewer is your screenshot from? Only Acrobat, with Simulate Overprinting switched on, will display it properly.
The Pantone Uncoated book is for selecting spot colours (specially mixed inks that are used instead of, or in addition to, the CMYK inks/toners).
Unless this will be printed CMYK + a separate ink for the turquoise, you need to either double click on its swatch, and change the Color Type from Spot to Process, or open the Ink Manager, and switch on 'All Spots to Process'. If you are actually printing the spot ink, the RIP used to create the image for the printing plates should render it correctly (as it looks in Acrobat with Simulate Overprinting switched on).
Seems like it has done the trick! Your a genius Danny, many thanks!!