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[laurent37812852j8ma]

Bonjour,

j'ai ouvert un gabarit PDF et créer on illustration à imprimer en 300cm par 100cm : le fichier fait 32000px par 12850px et 270,93cm de large par 108,8cm en 300 dpi.

Il est impossible de le convertir en PDF avec Photoshop, comment procéder ?

Merci

[davescm]

Photoshop's PDF save maximum size is 30,000 pixels.

So resampling to 280ppi will give you a pixel size of 29866 x  11994 pixels.  You will not see a difference, and even 280 ppi is overkill for such a physically large document. 

A document of such size is normally viewed from a greater distance than a magazine page. There is a formula for calculating required ppi, based on teh resolving power of our eyes. It is :   ppi required = 6878/viewing distance in inches.

So when viewed from 2 metres (78 inches), only 88 ppi is required. Anything above that cannot be resolved by normal eyes at that distance and is therefore wasted. That would reduce your document to a much more manageable 9386 x 3769 pixels.

Dave