**PURPOSE**- Decimate 2-D or 3-D real image/volume by averaging neighbouring pixels. Example.

**USAGE**- .OPERATION: DC S

- .INPUT FILE: PIC001

[Enter name of input file.].OUTPUT FILE: PIC002

[Enter name for output file.] - If input file is an image, SPIDER asks:

.DECIMATION FACTORS FOR X & Y: 3, 2

[Enter decimation factors for NX and NY dimensions. Factors are integers.]- If input file is a volume, SPIDER asks:

.DECIMATION FACTORS FOR X, Y, & Z: 3, 2, 3

[Enter decimation factor for NX, NY, & NZ dimensions. Factors are integers.]

**NOTES**

- In the above example, the dimensions of the the output file
will be reduced to NX/3, NY/2, NZ/3. Only every third,
second, and third (in respective dimensions) voxels will
be retained, the remaining voxels will be averged into the
output voxels.
- Pixel size in header is updated.

**SUBROUTINES**- DECIMATE

**CALLER**- VTIL2

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