Invert a picture’s colours using Preview
If you want to switch an image’s colours around, Preview lets you make light work of the task (and save ink when printing it out!)
• App credit: Apple Inc
You
could
use
this
technique
to
make
some
arty
images
Not too long ago, we needed to print a PDF document here at iCreate. Thing is, it made us break into a cold sweat because the text was white and the background was entirely black – if Future Publishing’s accountants spotted it, they’d surely tut with disappointment given that the cost of ink is pretty much on a par with fuel! Luckily, we had a little trick up our sleeve. We inverted the PDF in Preview so the text turned black and the background white. This is a really easy trick to do and you can use it to invert colours in any PDF or image, setting all of the colour values to their opposites on a colour wheel.