![]() ![]() Suffice it to say, when you save your image with any Alpha White in it, in PNG format, the Alpha White areas will be transparent.įirst, open an image in Preview (if Preview is not your default app for opening image files, control-click or right-click on the file icon and choose Open with > Preview) If anything they should have chosen 0.0 black for this as black is every color, so 0.0 black would mean the transparency of every color, but I digress. Theoretically any color at 0.0 would be fully transparent, and in my opinion the use of white is a bit of a misnomer. The alpha parameter of a color is somewhere between 0.0 (fully transparent) and 0.1 (fully opaque). If you have a program that shows the color values as numbers, like Adobe Photoshop or Adobe Illustrator, you will see that Alpha White comes in as 0.0 white, which is transparent white. This couldn’t have been done if the sky was not transparent. Another potential use would be for artwork or photos you want to manipulate digitally.įor example, if you wanted to be clever and poetic about how much rain we get here in Oregon, you could turn the sky into a swimming pool. One potential use is removing the background from images in order to insert them in documents or posters. You could also do this with other more robust (and expensive) software, but having this capability included in a built-in piece of software on the Mac is very useful. Preview’s Instant Alpha tool allows you to quickly make parts of an image transparent. Earlier this year, we blogged about Preview’s PDF annotation tools. Preview, macOS’s built-in image and PDF viewer, has quietly added many useful features over the years. ![]()
0 Comments
Leave a Reply. |