Before you can apply the Liquify feature to the metal grille, you must rasterize its vector mask and merge the mask and image to create just one image.
1 In the Layers palette, select the Metal Grille layer.
2 Choose Layer > Rasterize > Vector Mask. This converts the circles path, which is a vector graphic and resolution-independent, into a mask that is a raster image and resolution-dependent.
To view a mask by itself, Alt-click (Windows) or Option-click (Mac OS) the mask thumbnail in the Layers palette. You can then use the painting tools to add to or subtract from the mask. For more information, see Lesson 6, "Masks and Channels."
3 Choose Layer > Remove Layer Mask > Apply to merge the layer with its mask, creating a single rasterized image on that layer.
The Liquify command lets you interactively push, pull, rotate, reflect, pucker, and bloat any area of an image. The distortions you create can be subtle or drastic, which makes the Liquify command a powerful tool for retouching images as well as creating artistic effects.
Note: The Liquify command is available only for 8-bit images in RGB Color, CMYK Color, Lab Color, and Grayscale image modes.
You can use tools or alpha channels to freeze areas of the preview image to protect them from further changes, or thaw the frozen areas.
Certain reconstruction modes change unfrozen areas in relation to the distortions in frozen areas. You can hide or show the mask for frozen areas, change the mask color, and use a Brush Pressure option to create partial freezes and thaws.
-From Adobe Photoshop 7.0 online Help
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Adobe Photoshop can be a complex tool only because you can do so much with it, however for in this video series, we're going to keep it as simple as possible. In fact, in this video you'll see an overview of the few tools and Adobe Photoshop features we will use. When you see this video, you'll see how you can do so much with so few features, but you'll learn how to use them in depth in the future videos.