Image

FAQs - image

Your file is only high resolution at a certain size.

If you are dealing with a vector file, there is no resolution (vector files do not use pixels and cannot be said to be high res or low res). See vector graphics here.

Resolution illustration

Any file can be shrunk in size enough to make it high resolution. "Resolution" is simply a count of how many pixels a file contains in a given area (typically, a count of pixels per inch or ppi).

So is your photo high res? You can only answer this when you know how large it needs to be printed. Every raster image is made up of a grid of pixels. Pack more of them into a given area and the resolution increases (higher resolution). Spread those pixels out over a larger area (a larger print) and the resolution (count of pixels in every inch) drops.

Here's a method for figuring this out:

  1. Open the file in an image editor (Photoshop, Lightroom, etc.)
  2. Find out the pixel dimensions:
    1. In Photoshop, go to Image -> Image Size
      Image-size
    2. The image's pixel dimensions are shown in red. Divide these numbers by the desired output resolution. For example, the above image shows the resolution to be 176.825 ppi at 24.25 x 16.106 inches:
      1. 4288 ÷ 176.825 ppi = 24.25 inches wide
      2. 2848 ÷ 176.825 ppi = 16.106 inches high
      Dividing by a different resolution will yield a different output size. For example, if you need the image to be high resoluion you should divide by 300. Note that the output size drops accordingly (below). We're simply packing more of the available pixels into every inch:
      1. 4288 ÷ 300 ppi = 14.293 inches high
      2. 2848 ÷ 300 ppi = 9.49 inches wide

An image can be resampled in Photoshop but not with any gain in clarity. The image will indeed become higher res, but no additional true detail will be added to the image.

If you are not clear about resolution, feel free to give us a call.

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