World: r3wp

It's also occuring if I use the close gadget at the top right ..

Yes, it seems to be a result of using rebgui's display/parent ...

Can't find the DRAW group anymore, so I'm posting here.

Does anyone know if IMAGE-FILTER BILINEAR is working in Draw? I see 
no differences with NEAREST mode (which looks horrible when scaling 
down a big image, even with preserved aspect ratio).

If BILINEAR filter is not working or not implemented (while being 
documented), that would be really a pity to have to code my own bilinear 
filter in REBOL which would be probably too slow to use, or install 
a 10MB library like ImageMagic...

bilinear only works with scaling up

forget making smooth thumbnails with R2 :-)

I'm finishing attached files management for CureCode with thumbnails 
generation....too bad, you'll have horrible thumbnails...


Once again with REBOL, stuck at 95% of the goal and no (simple) way 
to workaround. That's how I usually loose all the time gained by 
using REBOL instead of another language...Where's that Rant channel? 
:-)

Fortunately R3 has no problem with this.

Nice, so now could you port Cheyenne + CureCode to R3 in one night? 
If not, I can't see how R3 can help me.

Just trying to help :-) I could see the use here for launching r3 
processes from Cheyenne for limited special functions. I assume the 
thumbnails are generated once?

Yes, I know, I'm really pissed off by the misleading Draw documentation...

there are wrappers to image-magick, no? Or - you could use nconvert 
from xnview package from command line too ...

just workarounds too ... before Cyphre fixes/extends Draw ... but 
I doubt any native changes are going to be backported to R2.

Yes, once only, I guess CALL would be ok, just need to install ImageMagic 
on Windows, test it, then install it on Linux server, test again, 
then add this package to the list of dependencies to maintain...cool!

get used to what other environments do ;-)

... well, just kidding ... I thought it is a one-time job ....

Well, the point in using REBOL+my own closely integrated frameworks 
is to avoid third-party dependencies...

Try contact Cyphre ... or I will ask him ...

If R2/Draw is not going to be updated, there's no point in bothering 
him.

Doc, I might have a resizer to make thumbs...

can't you call R3 from R2 ?

Ah nice! I started looking at http://en.wikipedia.org/wiki/Lanczos_resampling
to see if a REBOL implementation would be fast enough.

Just a test:

set 'resize func [img /local sz c1 c3 i2] [
	if file? img [img: load-image img]

	scale: img/size/x / 160
	sz: as-pair 160 round img/size/y / scale
	c1: 1x0 * sz
	c3: 0x1 * sz


 i2: to-image layout [origin 0 box sz effect [draw [image img 0x0 
 c1 sz c3]]]
	save/png %img.png i2
]

Call RESIZE with a loaded image. It'll save the img.png file, that'll 
have x-size of 160. It looks ok here.

Change the 160 to some other value, if you need other size.

That's almost the code I've made already. The issue is not having 
BILINEAR or any other good enough filter for thumbnails.

(or give it as an argument)

I'm working with 64x64

It seems to be ok without the filter, so maybe some default filter 
is in action. Let me check...

Lanczos (IrfanView) is giving incredible good results.

couldn't convolve filter be used somehow?

I use lanczos in XnView by default ...

you can blur the image before downscaling, but it can smear it more 
and the image isn't as clear.

How do you access CONVOLVE operator? (can't see it in Draw documentation)

btw - nconvert is 1.8MB one single exe with all filtering capability 
of xnview inside. Should be cross-platform too IIRC. But - the licence 
might not fit, I don't know ...

Doc, my version seems filtered to me. Have you tried?

do http://www.rebol.com/view/demos/convolve.r

Geomol: I'll try it right now.

This is what I get with my current code : http://softinnov.org/tmp/thumbs64.png

Hm, different to say 100%, if my version is filtered. Some results 
look ok, others maybe not so good.

left=REBOL, right=IrfanView

The original image is the CureCode homepage viewed inside Chrome 
(http://curecode.org)

Geomol: same result with your code.

Looking at the nconvert solution...

Yeah, you're right. Too bad. :-/

Looks like NConvert is a good solution for now. It's simple enough, 
supports the right filters and is multiplatform.

I tried resize both under Windown and OS X with same result. No filtering.

Pekr, thanks for NConvert link and for pointing me to Convolve operator, 
pity it's not mentioned in any of the View doc I know of.

Convolve effect could actually help get Lanczos filter implemented 
at mezz level with decent speed.