tailieunhanh - Adobe Photoshop 7.0 for Photographers- P7

Adobe Photoshop for Photographers- P7: In 1996, a group of self-proclaimed ‘digital’ photographers met together at Ian McKinnell’s studio in Holborn, London, to discuss the formation of a Digital Imaging Group. At first, this was a small gathering of professional photographers. The one thing we all had in common was a shared interest in using computers and their potential as a photographic medium of the future. | Confusion often arises when trying to understand the relationship between alpha channels masks Quick mask mode and selections. Let me help ease the learning curve by saying they are interrelated and essentially all part of the same thing. That is to say a selection can be viewed as a Quick mask or saved as an alpha channel also referred to as a mask channel . An alpha channel can be converted to make a selection which in turn can be viewed back in Quick mask mode. Also discussed later in this chapter is the use of image layer masks and vector masks and how to draw paths with the pen tool and convert these to selections. Selections and channels So when you read somewhere about masks mask channels image layer mask channels alpha channels Quick masks and saved selections the writer is basically describing the same thing either an active semipermanent or permanently saved selection. We will begin with defining a selection. There are several tools you can use to do this - the marquee lasso magic wand and Select Color Range. The marquee comes in four flavors rectangular oval single pixel horizontal row and vertical column. The lasso has three modes - one for freehand another for polygon point by point drawing and a magnetic lasso tool. When you use a selection tool to define an area within an image see Figure you will notice that a selection is defined by a border of marching ants. Selections are only temporary. If you make a selection and accidentally click outside the selected area with the selection tool it will disappear - although you can restore the selection with Edit Undo Command Ctrl-Z . Please purchase PDF Split-Merge on to remove this watermark. Montage techniques During a typical Photoshop session I will draw basic selections to define areas of the image where I want to carry out image adjustments and afterwards deselect them. If you end up spending any length of time preparing a selection then you will usually want to save the selection

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