_images has aliasing when downsampling and does not have gradients for bicubic mode. This implementation fixes those problems. To downsample color, grayscale, or monochrome images, choose an interpolation method—average downsampling, bicubic downsampling. Usually, I leave the compression as default which is ‘bicubic downsampling’ to – ppi which give me a MB file, then I decided to.

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On a much bigger print like a motorway banner? Or have I been outputting incorrectly all these years and should be using this?

Tutorial: Image Rescaling

Just need some context! I create all my images as CYMK. I don’t know when Do Not Downsample would normally be used, but the only time I have had the occasion was when standard downsampling resulting in a error, and a failure xownsample produce the PDF. Too many images being downsized too much – more than the system memory could handle.

Resampling (downsampling) explained

But it really is a magic number, the only benefit in downsampling at export is smaller file size—there’s no quality improvement because it’s always a down sample.


Usually line art needs considerably more resolution depending on what kind of line you are trying to resolve, so line art that needs color could benefit from more resolution—something like a fine woodcut or engraving with color applied.

The default Maximum JPEG compression will produce some compression artifacts but nothing a printing press is capable of downwample, or even anything you will see on screen. And there are advantages in not making the conversion because you can wait until export to decide on the correct CMYK destination profile.

Bicubic interpolation

Actually, that makes a lot of sense – but would a big image say 30, x 30, px benefit from that too? Whether the Downsample rule kicks in or not depends on the placed image’s Effective Resolution and not its Actual resolution. The default is anything over ppi gets downsampled, so all that matters is how your x pixel image is scaled in the layout and not its pixel dimensions.

If you placed it at 50×50 inches there would be a downsample because at that output dimension the Effective res is ppi—more than the ppi threshold. In line with what Rob wrote about line art, my most frequent use of my PDF setting that turns off compression and downsampling, is when I’m exporting a PDF for output that contains raster logos.


Resampling (downsampling) explained

It’s usually business stationery and the like, so there’s no photographic imagery I have to worry about bloating my file downsampoe, but it would be great if InDesign let you specify downsampling and compression for individual images. You don’t have JavaScript enabled. This tool uses JavaScript and much of it will not work correctly without it enabled. Please turn JavaScript back on and reload this page.

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Please type your message and try again. Many thanks for any advise, the picture below is for context.

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