Resampling and Cropping in photoshop

Think you have taken a picture on your latest mobile phone, and you want to print it for your album i.e 4 inch X 6 inch in size. But your original picture size is somewhere about 6 inch X 8 inch.
So now you have to otherwise resize/re-sample(this is done by the Transform commands) the image or crop the image to fit your size?
Suppose this is the picture you want to fit your frame. So what you will do with it? Crop or Resize.

Lets see what is Cropping and what is Re-sampling or Re-size.

Cropping cuts away part of the image to meet a target size.
Resampling retains all the image but shrinks or enlarges it to meet the target size.

The Crop works as simple as delete some part of your picture.
But Resize has some options or algorithm. When you re-sample your image you have to select one of the five methods available in Adobe Photoshop.

Here is the methods and how they works

Methods How they works where to use
Nearest Neighbor Maintains pixel color Artwork containing large areas of solid color like a pie chart or a simple logo. Avoid using with photos
Bilinear Maintains the sharpness Artwork having horizontal and vertical lines and blocks of your edges of color, such as Web page buttons; avoid using with photos
Bicubic Calculates the average of surrounding pixels when generating a new pixel General-purpose resampling for minor changes in image size
Bicubic Smoother Gives the most pleasing result when increasing the number of pixels (upsampling) Increasing the size of photographic images or artwork with gradients and gradual shifts in color
Bicubic Sharper Maintains the crispness of your Image For reducing the number of pixels in a photo (downsampling), also can be used when upsampling beyond 200%

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