Modes (Color and Image)
Refers to Bitmap, Grayscale, Duotone, Indexed Color, RGB Color (red,
green, blue), CMYK Color (cyan, magenta, yellow, black), Lab Color, and
Multichannel. These are the various modes that images can be brought
into and displayed in Photoshop. Each has special characteristics for
certain applications or uses.
Red, Green, Blue. RGB mode is the recommended
working mode for images in Photoshop. It allows you to apply layers,
filters, and non-constrained color palettes. Working in RGB mode also
allows you to save the file as a .jpg and .gif
along with several other file extensions.
Black, white, and gray mode. This mode will allow you to use layers and
certain filters. Working in this mode also allows you to save the file
in .jpg and .gif along with several
other file extensions.
The image mode is constrained to a color palette of 256 colors or less.
In this mode you cannot add layers, apply filters or add colors that are
not already used in the image. You cannot use most of the editing tools.
This mode allows the file to be saved as a .gif, .psd
or .pdf (Photoshop formats), or .png. Saving as other
types of files may cause a distorted image.
Photoshop allows you to create anti-aliased text, which results in
smooth edges of letters. Anti-aliased
edges on a selection or text gives a smooth-edged appearance. Blending
the edge pixels with the surrounding pixels produces this effect. If
aliasing is turned on (aliased), a jagged
stair-stepped appearance results.
Squares (pixels) of color placed in uniform rows to form an image. You
can save as a Bitmap file (.bmp or .btmp) and several
other file types.
The overall dimension of the image. In Image and Canvas
sizes you can increase or decrease numerically the dimensions of the
image. Any additional area you add to your canvas will appear as a color
border around the original canvas. This border will appear in the same
color as your background color unless you choose a different color
before you adjust the canvas size.
Distinct bands of color resulting from the reduction of the color
palette of an image.
Dots per inch/pixels per inch. These are resolution measurements used by
scanners, printers and Photoshop. The resolution of computer monitors is
72 dpi/ppi. Gif and jpg images should
be adjusted to this resolution for final saving and display.
Applies color or a percentage of color to a selection.
Special effects that are applied to all areas, selected areas, or layers
of the image. You can choose from a variety of effects, from adding
artistic rendering to sharpening and blurring images.
Uses the tolerance specified in the Magic Wand Options palette
to select pixels adjacent to the pixel selected.
The overall size of an image in print size. Print size can be determined
by percent, inches, centimeters, points, or picas. Using Image
size, you can choose measurement type and adjust dimensions and
NOTE: Use caution when increasing the
resolution or actual dimension of the image: it may result in a less
Layers act as separate films, much like transparency sheets.
Each layer contains objects which, when layered together, create a
composite image. Each layer contains its own discrete contents.
The transparency that you affix to a tool, layer, or color. The lower
the percentage is, the more transparent the effect; the higher the
percentage, the more opaque the effect.
Applies color or a percentage of color to an area within the tolerance
setting of the pixel addressed. This differs from Fill because
it affects those pixels within the tolerance,
whereas Fill affects all of the pixels within the selection.
A grid square that consists of one color. In combination with all of the
other pixels, it makes up the image that we see on screen. All Photoshop
images are bitmapped into pixels.
Selects like color pixels that are already selected throughout the image.
A border applied with the foreground color to selected portions of an
image. Stroke is measured in pixels and can be placed on the outside,
center, or inside of the selection.
A value range from 0-255. The lower the number entered the more similar
the color that will be selected. The higher the value the broader the
color range that will be selected.