Rafael Sierra

I am also getting SIGSEGV after calling `ResizeWithVScale`: ``` fatal error: unexpected signal during runtime execution [signal SIGSEGV: segmentation violation code=0x1 addr=0x60 pc=0x7f6556ebc1e3] runtime stack: runtime.throw({0x22da54d?, 0x7f6528e4c730?}) /usr/local/go/src/runtime/panic.go:1047 +0x5d fp=0x7f652bdccc90...

I found out that the root of the problem was that some images had grayscale/b-w color space, and calling `im.ToColorSpace(vips.InterpretationSRGB)` before applying other operations solved the issue.

I finally had time to look deeper into the issue and (obviously) it's user error. This is the minimum code I need to reproduce the sigsegv: ```go package main import...