Case Study 3 - The Horrible DPI Mistake

Here's the scenario - a print shop/graphics designer/magazine asks a client for a photo at 300 dpi. They wish to print ito ut 7" x 5". The client already has a beautiful digital photo with pixel dimension of 2048 x 1536. The client notices that the photo editing software is showing that the photo is set to 72 dpi. So, following orders, the client types in 300 to reset the dpi to 300. In doing so the image is resampled and is enlarged over 4 times to pixel dimensions of 8533 x 6400. The client sends this enlarged 300 dpi photo. The print shop/graphics designer/magazine rejects it (too grainy, too colour blotched). The client is crushed.

The sad thing is that the client already had the perfect photo (2048 x 1536 @ 72 dpi) which would have been beautifully printed at 7" x 5" ...


ANSWER:
EXPLAIN DPI, PPI, and resample.

DOT PER INCH (printer pakai dot per inch)
PIXEL PER INCH (monitor pakai pixel per inch)

Don't resample the image, just increase the DPI. To do this, the client need to unclick the resample image option in the Image Size Window.

If the print shop designer said he cannot print the image because the image is too small, his printer model must be out of date. He must change his printer to a latest model.


Cara kiraan Document size

pixel
WIDTH = 230 pixels
HEIGHT = 344 pixels

Document Size
WIDTH = 3.194 inches
HEIGHT = 4.778 inches

Resolution = 72 PPI or pixel/inches

Document Size Width: 3.194 inches = 230 bahagi 72

NO RESAMPLE (resample unclicked)

Kesimpulan:
DPI is nothing to do with digital image resolution or quality

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