fixed : quickly create a printable grayscale picture from a color photo using Preview.app

Question :

I often have color pictures (like photos) that I would like to print in grayscale, but I don’t have a grayscale printer.

What is the simplest way to do so ?

 

Answer :

Having a color printer is great, and the easiest way to print grayscale pictures is to just select the grayscale-option before printing :

  • open the picture (ussually a .jpg) in Preview.app
  • in the top-bar, go to File and select Print from the pulldown list ; or press the [CMD]+[P] key-combo on your keyboard
  • in the pulldown window that opens, click on Preview and select Graphics from the pulldown menu
  • then, at Color Mode, select “Grayscale” (instead of “Color”)
  • then click the Print-button and see what comes out of your printer
  • Note that if you would make a PDF now, that it’s not going to be a grayscale picture…

Sometimes this will do just fine, but often that isn’t enough, and you will need to do a few extra steps to get an acceptable result out of your printer :

  • open the picture (usually a .jpg) in Preview.app
  • click on the “Show Markup toolbar”-button (the circle with the pen-point in it, just left of the Search-bar top-right)
  • first, crop the image if needed :
    • then, click on the DashedSquare-icon (top-left) and select the “Rectangular Selection” option
    • on the picture, select the area you want to use (click the top-left of the envisioned area, than botom-right) and the selection area will be displayed
    • if you need to, adjust the selection area by dragging it’s edges
    • then, in the top-bar, go to Tools and select Crop from the pulldown list ; or type the [CMD]+[K] key-combo on your keyboard
    • now the picture will be croped to the smaller ‘selection only’ size
  • then, in the top-bar, go to Tools and select Adjust Color from the pulldown list ; or type the [CMD]+[ALT]+[C] key combo on your keyboard
  • in the AdjusColor-window that opens there is a ‘histogram’ (a picture with red/green/blue (a.k.a. RGB) graphs) with an AutoLevels-button, a list of 9 sliders and a ResetAll-button below it
  • attached to the base of the histogram, there are 3 slider-pointers (a.k.a. histogram-sliders)
  • set the middle histogram-slider lower (a little to the left)
  • then set the right histogram-slider lower (a little to the left)
  • then set the Exposure-slider higher (a little to the right)
  • set the Contrast-slider higher (a little to the right)
  • set the Sepia-slider in the middle
  • set the Sharpness-slider higher (a little to the right)
  • see if the (color) picture’s look is now clearer …if not go back and adjust the sliders until it is a brighter picture with more detail
  • then, in the top-bar, go to File and select Print from the pulldown list ; or press the [CMD]+[P] key-combo on your keyboard
  • in the pulldown window that opens, click on Preview and select Graphics from the pulldown menu
  • then, at Color Mode, select “Grayscale” (instead of “Color”)
  • then click the Print-button

that’s it !

Note : if you would make a PDF now, that it’s going to be a color-picture, not a grayscale picture… if you need a grayscale picture digitally, you will need to use Photoshop  or something similar…

Important extra note : once the picture is a PDF, you can no longer adjust the colors

enjoy 😉

 

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fixed : animated GIFs not playing in Preview.app

Question :

For my work I regularly get animated-GIF for online advertising campaigns send to me offline. As it turns out I can only view them in the Finder’s preview, but when I double-click on them, they open in Preview.app as a static picture…

What can I do ?

 

Answer :

As any .gif-file is considered as a picture by OSX, both static and animated GIFs will be opened in Preview.app by default. Too bad, but Preview.app can only display static pictures, no movies, nor dynamic pictures…

The solution is simple ; just make OSX by default open all .gif-files in an application that can handle animations, like your web browser.

to do so :

  • locate and select any of your animated .gif-files in the Finder
  • then press the [cmd]+[i] key-combo on your keyboard (a.k.a. “get info”)
  • in the info-window that opens, scroll down to “Open with:”
  • make sure the triangular arrow in front of “Open with:” is pointing down
  • if the triangular arrow is pointing to the right, click on it
  • just below “Open with:” you will see “Preview (default)”
  • click on that, and change it to “Safari” (or any other application that can handle animated GIFs, if you don’t see the application you’re looking for listed, select “Other…” and select the one you prefer from you Applications folder)
  • then, don’t forget to click on the “Change All…”-button also

…that’s it, from now on, any .gif-file on your Mac will be opened in Safari (or your chosen alternative) by default, and you will see all animated-GIFs opened as animations when you lick on them.

enjoy !

😉

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