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Reference
Photoshop supplementary functions
These supplementary functions are used during retouching.]
Changing resolution
Crop Tool
Unsharp mask filter
Copy Stamp Tool
Adjustment layer
Level compensation
Color balance
Tone curve
Hue and saturation
     (chroma)
Selecting a specific
     color level
デジタル写真の基礎知識
レタッチ作業の環境
photoshopのインターフェイス
Photoshop supplementary functions
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Crop Tool

 Use the Crop tool to eliminate an unnecessary part of an image, and crop the image to fit the printer paper.
 One of the Crop tools enables you to specify the size and resolution after you have cropped the image. The parameters are specified in the Tool Option bar. The other Crop tool does not allow you to specify these parameters. If you determine the specific printer paper such as a postcard size or 4x6 size, crop the image to fit the printer paper without generating a margin by specifying the size and resolution. If you set the resolution to approximately 300 dpi, a high-quality image equivalent to a photo will be printed.

 

Cropping to fit the printer paper


 In the example, we will crop the edge of the photo of the cows peacefully idling by the riverside so that the cows will look larger, and crop the image to fit the 4x6 format at the same time.
 

1Selecting the Crop tool and specifying the crop parameters


 From the toolbox, select the Crop tool. Specify the size and resolution in the Tool Option bar. Since this photo is in the 4x6 format and horizontally oriented, the width is set to 6 in and the height to 4 in after cropping. The resolution is set to 300 dpi.
 

2Confirming the option settings


 Drag the area you wish to crop. As the width and height are specified, the area will be specified while maintaining the aspect ratio. When you drag the marquee, the external area becomes dark and the portion of the image that remains is clear. To change the area after you have released the mouse button, move the pointer to the corner of the selected areas.
 

3 Executing the crop


 Once you have determined the area you wish to crop, click the button on the Tool Option bar to execute the crop. The same operation can be performed by double-clicking over the area that you have dragged, instead of using the button. This operation makes the image fit the 4x6 format.
 




 With the Crop tool, it is possible to change the angle of the image as well as crop it. Let's practice this operation.

1 Selecting the Crop tool and specifying the crop parameters


 The image below is the same image of the ranch as before, but it is slanted to the right. Crop it in the 4x6 format (6 in wide by 4 in high) with the resolution set to 300 dpi, while correcting the angle.
 

2 Dragging the area to be cropped


 Specify the area you wish to crop by dragging.
 

3 Angle adjustments


 After specifying the areas to be cropped, move the mouse to the dotted line indicating the area. The mouse pointer changes to one indicating rotation. Drag the mouse to the left or right and upward or downward to rotate the area to be cropped. Adjust it to the appropriate angle.
 You may have to specify the area to be cropped again depending on the angle after adjustment. In this case, make the adjustment by dragging the pointer to the corner.
 

4 Executing the crop


 Once you decide on the area to be cropped and the angle, click the button in the Tool Option bar to execute the crop. The image is cropped and is rotated to the specified angle.
 
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