https://github.com/anthonynsimon/bild has parallel image ops of all sorts and 
is widely used & well supported.

- Randy

> On May 10, 2020, at 9:52 PM, robert engels <reng...@ix.netcom.com> wrote:
> 
> I don’t know and I doubt anyone else does off the top of their head, so why 
> don’t you write a test and see?
> 
> Image processing is highly image and usage dependent, e.g. acceptable quality 
> vs. speed vs. memory.
> 
> Using non-quantifiable terms like “huge” is not testable nor verifiable.
> 
>> On May 10, 2020, at 9:50 PM, Vivi <createmap4...@gmail.com> wrote:
>> 
>> 
>> How does it compare to vipsthumbnail that utilize low memory usage which I 
>> believe it use horizontal threading, does Go's image/draw package consume 
>> large memory if the image source is huge?
>> 
>> 
>> On Monday, 11 May 2020 07:00:11 UTC+8, Nigel Tao wrote:
>> On Mon, May 11, 2020 at 4:28 AM robert engels <ren...@ix.netcom.com> wrote: 
>> > All of the code to do scaling and cropping in the ‘image’ package in the 
>> > stdlib. 
>> 
>> Cropping is in the stdlib but scaling is not. Various scaling 
>> algorithms (e.g. nearest neighbor, Catmull-Rom) are in the 
>> golang.org/x/image/draw package instead. As 
>> https://godoc.org/golang.org/x/image/draw says, "This package is a 
>> superset of and a drop-in replacement for the image/draw package in 
>> the standard library". 
>> 
>> https://godoc.org/golang.org/x/image/draw#example-Draw has some example 
>> code. 
>> 
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