Image Size Resolution

[steveg73545872]

Hi, I have a jpeg image photographed that has been supplied at 100% size at 350ppi however I need to tile this up to make a large image size so I need to scale by 10% of final size. I need the image to be 350ppi at 10% size but to retain the pixel data I need to uncheck resample which when scaled to 10% makes the resolution 3500ppi.

Images at 35ppi at final size for a 20m print should look fine however this looks more like 3ppi when I resample and when I don't resample its 3500ppi and 17gb file which does look correct. Please help me understand.

[Test Screen Name]

Also DO NOT choose No compression. Choose ZIP or carefully choose JPEG. That's just wasting space.

[Test Screen Name]

Hmm, on reflection, if you are placing in Illustrator why are you doing anything in Photoshop at all? Just place it, then scale it.

[Stephen Marsh]

So you need a gravel background image that is 7 metres wide by 4.35 metres tall. You need to decide on a resolution for this canvas. This will likely be printed on a wide/grand format inkjet and usually viewed from some distance, however it may also be viewed "close". You will need to pick a lower resolution, you will not need 300+ pixels per inch. I'm guessing that somewhere between 25 to 50 ppi will be workable in file size, 70+ will start to become unwieldy.

I would try to create a seamlessly repeating tile as a source for a tiled pattern fill at the desired gravel print size, you can search for how to do this there are many tutorials, some better than others. Then perhaps use the patch tool to try to randomly break up the pattern a bit.

[steveg73545872]

Image below is the original jpeg at 350ppi and at 100% size.

Image below is taking the original jpeg, scaling to 10% (1:10) of finished size with resample unchecked, copied in to a Photoshop canvas size of 700mm wide (1:10) then placed in Illustrator where I have enlarged by 1000% to create a PDF to view at 100% size (Cropped from Finished size) with no resampling done.

Thanks

[Test Screen Name]

This "more info" box - what is showing it? If this is Mac OS finder, its dimension is USELESS to you. This is not the size in pixels you may think it is! Just don't use Finder to check the size of a PDF, still less to check the resolution of an image in a PDF (remember, a PDF may have many pages, each a different size, with many images on each, each one of a different size).