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Y
Ylang
Participant
January 20, 2017
Answered

Resolution d'image HD

  • January 20, 2017
  • 3 replies
  • 692 views

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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    This topic has been closed for replies.
    Correct answer Barb Binder

    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.

    3 replies

    Jeff Witchel, ACI
    Community Expert
    Jeff Witchel, ACICommunity Expert
    Community Expert
    January 20, 2017

    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.

    Barb Binder
    Community Expert
    Barb BinderCommunity ExpertCorrect answer
    Community Expert
    January 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.

    ~Barb at Rocky Mountain Training
    cinziamarotta
    cinziamarotta
    Participating Frequently
    January 20, 2017

    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:

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