Guides, Grid or Pixel Grid can be enabled or disabled using View - Show - Guides. Photoshop is still working exclusively with the pixel dimensions. To add or delete a guide, select the Move tool and enable rulers. Close the Threshold dialog window without clicking any of the buttons. Notice any difference in the image Nope None. Adjust the sliders so that the dark, low-value pixels that represent water turn red, but those that represent land don't change. The Threshold dialog window allows you to highlight pixels in an image that have values within a range you define. To change the ruler measurements from pixels to inches in Photoshop, go to Photoshop (Mac) or File (PC) > Preferences > Units & Rulers. This action converts each pixel's color information into a brightness measurement.
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