I'm working on a jpeg image in Preview, but noticed I don't have the option to chose instant alpha under the select menu. Can anyone explain why this may be the case?
The JPEG format doesn't support alpha channels. Use PNG.
What Linc Davis is trying to say is.... EXPORT/DUPLICATE your jpeg as a PNG and try again.
I exported a pdf as png, opened it and have no Instant Alpha option. Is there another way to get this to work?
Start with a png file.
You have to go to View > Show Edit Toolbar.
Then widen the window so that you can see all of the icons.
Then click the icon that looks like a magic wand.
And then click and drag on the color you want to erase.
Retrieving data ...