====== Modifications – Crop ======
Crop outputs only part of its input image: a rectangular region, a set of spectral bands, or both.

<WRAP group>
<WRAP half column>
**A rectangular window**

{{ :basic_level:modifications:hoku_basic_crop_1.png?nolink&400 |Crop with a window entered}}

Enter a "window" of four numbers: the x and y position of the upper-left corner, then the width and height, in pixels. x is 0 at the left edge and increases to the right; y is 0 at the top and increases downward. Only the pixels inside the window pass through Crop. If you give no window, the full image is used.
</WRAP>
<WRAP half column>
**A set of bands**

{{ :basic_level:modifications:hoku_basic_crop_2.png?nolink&400 |Crop with bands set to 3:12}}

Enter "bands" to keep only some of the spectral bands. ''3:12'' outputs 10 bands, from band 3 to band 12. Bands use the same syntax as in ReadImage; see [[basic_level:readimage:spectral_band_arguments|Spectral Band Arguments]].
</WRAP>
</WRAP>

You can enter a window and bands at the same time. Crop then outputs only that region, with only those bands.