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Resolution d'image HD

New Here ,
Jan 20, 2017 Jan 20, 2017

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Bonjour,

je suis un peu perdue au niveau des résolutions d'images...

j'ai donné un fichier à un imprimeur qui m'a dit que la résolution était mauvaise (68dpi) , or,

pour ce fichier qui fait 120cmx228cm, j'ai importé dans Indesign une image en 300 dpi, que j'ai (certes) agrandie et j'ai exporté mon pdf en qualité optimale sans sous échantillonnage et sans compression.

Pouvez vous me dire comment, du coté de l'imprimeur la graphiste s'est retrouvé avec une résolution de 68 dpi ?

Je ne comprends pas.

Quelqu'un aurait-il des solutions avoir une meilleure qualité ? sans avoir un fichier trop lourd car

j'ai un pc et un mac pas assez puissants pour exporter de gros fichiers.

Merci beaucoup.

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correct answers 1 Correct answer

Community Expert , Jan 20, 2017 Jan 20, 2017

Elaborating on the answer above this one:

If your image began at 300ppi and you enlarged it, you changed the effective resolution to 68ppi. Keep an eye on the Links panel, and in particular on the effective ppi. It's rarely ok to enlarge an image in InDesign for the reason you just described. Talk with your printer about the lowest acceptable ppi before you send over another job.

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Enthusiast ,
Jan 20, 2017 Jan 20, 2017

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Hi,

Before printing it is important to check the effective resolution of the image, that obtained after resizing. You can check this value from the LINKS panel:

ID_resolution.png

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Community Expert ,
Jan 20, 2017 Jan 20, 2017

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Elaborating on the answer above this one:

If your image began at 300ppi and you enlarged it, you changed the effective resolution to 68ppi. Keep an eye on the Links panel, and in particular on the effective ppi. It's rarely ok to enlarge an image in InDesign for the reason you just described. Talk with your printer about the lowest acceptable ppi before you send over another job.

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Community Expert ,
Jan 20, 2017 Jan 20, 2017

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General rule of thumb with pixel images.

If you start with a high-resolution (300 ppi) image and Place it in InDesign at 100% it will still be 300 ppi when you print.

If you make the image any larger that 100% in your InDesign layout, the Effective Resolution will be less than 300 ppi.

For instance, if you make the 300 ppi image, 200% in your layout, the Effective resolution will be just 150 ppi. It's the same number of pixels being spread out over a larger area. So you'll end up with less pixel per inch.

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