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DOC: add warning note to imsave

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Original file line number	Diff line number	Diff line change
`@@ -1547,7 +1547,15 @@ def imread(fname, format=None):`
`1547`	`1547`	`defimsave(fname,arr,vmin=None,vmax=None,cmap=None,format=None,`
`1548`	`1548`	`origin=None,dpi=100,*,metadata=None,pil_kwargs=None):`
`1549`	`1549`	`"""`
`1550`		`- Save an array as an image file.`
	`1550`	`+ Colormap and save an array as an image file.`
	`1551`	`+`
	`1552`	`+ RGB(A) images are passed through. Single channel images will be`
	`1553`	`+ colormapped according to cmap and norm.`
	`1554`	`+`
	`1555`	`+ .. note ::`
	`1556`	`+`
	`1557`	`+ If you want to save a single channel image as gray scale please use an`
	`1558`	`+ image I/O library (such as pillow, tifffile, or imageio) directly.`
`1551`	`1559`
`1552`	`1560`	`Parameters`
`1553`	`1561`	`----------`

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