World: r3wp

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.

view layout [text-list "this" "is" "a" "text" "list"]
myFile.txt contains "this" "is" "a" "text" "list"
how can I:
view layout [text-list read %myFile.txt]
? 
tia

everything inside the layout [  ]
is not rebol code .. it's a dialect

VID = Visual Interfaces Dialect.

Doc - Cyphre confirmed bilinear filter is missing in R2 draw. It 
could be added, if we wish so for R2 updates. In R3, there is new 
parameter for such purposes, called RESAMPLE

so you can do this ... get the block first

data: to-block read %myfile.txt

and then compose on the block

view layout compose/only [ text-list (data) ]

Thanks Graham. 
view layout compose [text-list (data)] ; worked

view layout [text-list data parse read %myfile.txt  ""]

Pekr: thanks for the confirmation. Why does it appear in documentation 
then? http://www.rebol.com/docs/draw-ref.html#section-3.15

Anyway, thanks to you and nconvert, I could deliver the new CureCode 
feature to my customer this morning.

I think I'll drop View support in Cheyenne completely in the next 
release and search for a suitable third party graphic library to 
add.

good idea

If View sucks, well then. But it is a good measure of how it is "usable" 
in real-life ...

try image magic.  its fast, easy to use on the command-line, it can 
process in up to 640 bits images and there is limit on capacity as 
it can actually use disk as ram while its processing!  I rendered 
20GB worth of images into one composite ... using 500MB of ram.

and there are no higher quality engines out there... but that all 
depends if it does what you need in terms of image and graphics.

we can't build an extension for imagemagick yet, can we?

yes we could.

I hadn't even tought about that

at this rate, we could have a dozen extensions by spring.

Do we have any extensions yet?

two so far, AFAIK

and they are available somewhere ?  What are they?

Not available yet. Not sure they will be, but maybe. Robert is working 
on an SQLite extension and a Windows COM interface.

there is a text to speach extension that has been released on the 
extensions group.

I have done three  "experimental" extensions : a text to speech, 
a matlab engine extension, a simple windows api with some useful 
calls : http://www.colineau.fr/rebol/R3_extensions.html

Cool Jocko. I have an old send-keys dialect as well. I think I did 
a dialect experiment over MCI command strings, but I'm not sure if 
I posted it anywhere.

Max, thanks for the additional info. Actually, NConvert is great 
but only as a command-line tool, it's not available in library form, 
so I'll probably end up wrapping Image Magick.

there is already an image magic R2 wrapper on rebol.org you can use 
to start, I've used it and it works... but you need to find the proper 
version of image magick (an older version).

Doc, BILINEAR is in R2 but you can only upscale with that filter. 
Not good for thmbnails. If Carl want's to do frequent R2 updates 
it would be easy for me to add downscaling+lanzos filter to R2 DRAW. 
I think this is one of most requested feature and I actually have 
it already implemented in my separated R2draw.dll

Other possibilty would be to use my R2 JIT compiler and program the 
filter as JIT function. Could be a good test example but not sooner 
until I get it to 'alpha stage' ;-)

Cyphre: great, so we will get downscaling bilinear+lanczos filters 
in 2.7.8 next month? :-)

If Carl have time for including/testing the change then why not. 
I can add the low-level code in a hour or so. But the dialect parser 
change needs to be tested after Carl compile the new r2 exe.

So in other words: bug Carl about this one :)

Looks like a job for Pekr! ;-)

It would be really helpful, firing a 10MB package just to get decent 
thumbnails is hurting my programmer's feelings. Making thumbnails 
is one of the most common task today in web sites for a graphic library.

Would it be too slow to calculate it in plain REBOL for your application?

If yes, then you could make a thumbnail algorithm in plain C and 
build your own dll. Calculating each pixel in the thumbnail as a 
mean value of a number of pixels in the original image should give 
a nice result, I think.

For Lanczos filter, I find it even slow with NConvert for bigger 
images (1MB+), but I guess that the CALL overhead is significant 
there.

I thought about it but don't have enough free time to implement it 
myself. Btw passing image! datatype through a routine! is quite tricky 
IIRC?

with proper thumbnailing in r2, you are good on the way to implement 
a photo album browser. as it is now, that's not possible.

Oh, I forgot that the server it's running on has a mono-core Atom 
as CPU! Speed should be ok starting from a mid-level CPU.

I haven't got experience with routine! calls, so I can't say. A way 
to get the data to the C code is to save it on disk as BMP from REBOL 
first. If you need really high speed, this might not do it for you 
though.

Or in stead of BMP, just save it as binary. (Which is about the same, 
I guess.)

Now I'm in doubt of the correct term. Is it still called bilinear 
filtering (which is bilinear interpolation), when scaling down? I 
mean, we're not doing interpolation then, but instead calculating 
mean values.

I think the correct term is 'filter with resampling'. If you add 
the resampling step then the image looks much beter. Then different 
filter algorithms can even improve the quality (usually the beter 
filter the slower the calcualtion is)

R2 Draw is currently using only 'resizing' not 'resampling' routine.

Doc - I am good at bugging anyone, so just confirm you want it :-)

Doc - nconvert is an exe, but xnview package has complete API to 
wrap. We even did some basic stuff in the past with Cyphre ...