The commands in Image menu are used to change the size, shape, resolution, and format of a digital file.
Here is how we use it,
Here is how we use it,
- Image size. Use this palette in Elements to set the final size and resolution of your digital file. When opened (Image> Re-size >Image size), it shows the width and height of the current image in inches (or cm), and the number of pixels. beneath this is a resolution, which is normally expressed in pixels per inch (ppi). Ppi is sometimes confused with dpi (dot per inch), which is used to describe print quality. The higher the ppi, the better the quality of the image. For most uses however, 300ppi will be the highest required setting. 200ppi is often adequate for prints smaller than letter paper (A4). For images that will only ever be seen onscreen, 72ppi should be sufficient as this is the resolution of standard computer screens.
- Changing the image size. To change the size of an image (known as interpolation when it is enlarged), change either the Width or Height in the Document Size box. The chain symbol linking these two measurements means that the corresponding dimension will increase in proportion. If there is no chain, tick the Constrain Proportion Box.
- Extra pixels. When the physical size of an image is changed, you will notice that the number of pixels increase, too. As pixels are tiny square of pure colored tone, the computer simply copies and replicates pixels to fill in the increased space caused by the interpolation. Of the different choices for this under re-sample image, Bicubic is recommended as the most efficient. This sounds crude, but as long as the size increase is not too extreme, an excellent result can achieved this way.
- Resolution. Often, an increase in size is combined with an increase (or sometimes reduction) in the resolution by changing the amount of ppi (pixel per inch).
- Canvas size. It is possible to increase the canvas size, while leaving the image size untouched (image>resize>canvas size). The extra space will appear empty, though this can be given a color or left clear.
- Mode : RGB. Modes govern which color scale a file is saved in. The most common and useful is RGB, where the image is divided into three basic colors: Red, green, and Blue. When seen together, the impression of full color is given.
- Mode : CMYK. Is used in reproduction so, for professional reprographic companies, the ability to prepare files in CMYK is very important.
- Mode: Gray scale. use this mode to convert the RGB file to black and white with a full range of tones. Be aware that the file size is reduced by one third, RGB is made of three different gray scales, each one representing red, green, or blue. Shown on the computer screen and viewed together, they give the impression of full color.
- Mode : Duo tone. gray scale images can be converted to Duo tone, a method of digital toning based on a reproduction process using two or more different inks. In Photoshop, the density of the colors used will depend on how the contrast is manipulated for each color using Curves.
- Rotate canvas. In the Rotate sub menu, the first group of options is for changing the orientation of the whole image to any percentage, or for flipping the image on a horizontal or vertical axis. the second group applies similar commands but only to the layer that is currently active.
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