[Bf-committers] Big Blender User!!

Gruber Aurel augruber at student.ethz.ch
Sun Apr 17 00:03:24 CEST 2016 

That is correct only for 8-bit channels, that is 32 bits per pixel. That is why saving to EXR is highly beneficial because you can save 16 or even 32 bits per channel. 

with 16 it would amount to:

( 2^16 ) ^ 3 = 281’474'976'710'656

Hope this helps

Aurel

> On 16 Apr 2016, at 23:42, Doeke Wartena <doeke.wartena at gmail.com> wrote:
> 
> Correct me if i'm wrong.
> RGB = 256*256*256 = 16,777,216
> CMYK = 100*100*100*100 = 100,000,000
> 
> 2016-04-16 23:12 GMT+02:00 Troy Sobotka <troy.sobotka at gmail.com>:
> 
>> There is no such thing as “CMYK” any more than “RGB” is.
>> 
>> In the same way that RGB defines three uniquely coloured lights for each of
>> red, green, and blue, so too does CMYK define a unique ink for cyan,
>> magenta, yellow, and black. In addition to this, you have to factor in the
>> colour of the paper, the ink response to paper, and light source.
>> 
>> Given the above, there is no single method to convert to CMYK, and anyone
>> that tells you so is an idiot.
>> 
>> There _is_ a method to properly do so has been around for a while; ICCs.
>> 
>> If you would like to take something from Blender to print, there is only
>> one advisable method to do so (assuming you are using the default
>> configuration):
>> 
>> 1) Tag / Attach an sRGB v2 profile to your rendered output.
>> 2) Use another tool to convert and prepare your image for print using the
>> proper ICC profile of your chosen printer. This considers the ink colours,
>> total area coverage of the printer (TAC), black point compensation (BPC),
>> etc. All of this will be in the ICC profile of your printer.
>> 
>> Typically these days, for non professional printing, the print houses will
>> simply require you to ship your image in RGB with the colour space
>> information attached, which step (1) above would do. Preparing a document
>> ready for professional grade printing / rasterizing would require going a
>> step further and using the tagged image in a tool such as Scribus or
>> InDesign.
>> 
>> TL;DR: There is no way to properly prepare an RGB image for print properly
>> from within software without leveraging proper and unique ICCs for each
>> printing context. Though beyond Blender's scope proper, it is painless with
>> a little knowledge and an external tool.
>> 
>> With respect,
>> TJS
>> 
>> On Sat, Apr 16, 2016, 10:06 AM Knapp <magick.crow at gmail.com> wrote:
>> 
>>> Perhaps you can open it in Krita and save as PS format? I know that Krita
>>> can read PS format files but I am not sure about saving them. In any case
>>> you might want to just switch to Krita.
>>> 
>>> On Sat, Apr 16, 2016 at 2:11 PM, Jens Verwiebe <info at jensverwiebe.de>
>>> wrote:
>>> 
>>>> Hmm
>>>> 
>>>> I darkly remember i added one day psd format ( to oiio ? ) on mac ?
>>>> Or was it only import or i muddled somemething cause it was long time
>>> ago ?
>>>> Dalai was envolved too, so perhaps ask him if he remebers.
>>>> 
>>>> Jens
>>>> 
>>>> 
>>>> Am 16.04.2016 um 10:45 schrieb Siva:
>>>>> Hi Stephen
>>>>> 
>>>>> As far as I know
>>>>> not only blender, renders from any 3d Software is going to suffer the
>>>> same fate, when it comes to CMYK printing
>>>>> there is no software which renders to CMYK
>>>>> 
>>>>> renders are very similar to photographs, they are stored internally
>> in
>>>> RGB and are not designed for CMYK
>>>>> 
>>>>> like Bastien rightly said, exr would preserver all the data and hence
>>>> might ease your conversion process.
>>>>> 
>>>>> Your printing people might be able to help you in easy and right
>>>> conversion process.
>>>>> 
>>>>> and an addon to convert psd is again going to give you a PSD file in
>>> RGB
>>>> colorspace not CMYK. So technically there is not going to be any
>>> difference
>>>>> 
>>>>> this is one of the articles about the topic
>>>>> http://forums.cgsociety.org/showthread.php?t=58907
>>>>> 
>>>>> regards
>>>>> Sivaprasad Velayudhan
>>>>> Director - Operations
>>>>> Mob: +91 99400 14644
>>>>> Mail: siva at realworks.in
>>>>> 
>>>>> Realworks Studios India Pvt Ltd.,
>>>>> 7/1, V.S.K. Building, Thondamuthur Road, Vadavalli
>>>>> Coimbatore - 641041
>>>>> Tamil Nadu
>>>>> India.
>>>>> 
>>>>> ----- Original Message -----
>>>>> 
>>>>> From: "Bastien Montagne" <montagne29 at wanadoo.fr>
>>>>> To: bf-committers at blender.org
>>>>> Sent: Saturday, April 16, 2016 1:10:05 PM
>>>>> Subject: Re: [Bf-committers] Big Blender User!!
>>>>> 
>>>>> I’d have expected EXR to be the format of choice here (assuming - and
>>>>> hoping - photoshop does open that format, either natively or through
>>>>> plugins)? Being an HDR floating point format, it should allow for any
>>>>> kind of color conversion with (nearly) no loss of quality. And it can
>>>>> store several render passes separately, which can also be quite
>> useful
>>>>> in post-process afaik…
>>>>> 
>>>>> Le 16/04/2016 08:49, David McSween a écrit :
>>>>>> Perhaps cmyk conversion is hard but I wonder if you could apply a
>> lut
>>>> via
>>>>>> color managment before saving?
>>>>>> On 16 Apr 2016 4:06 pm, "Stephen Keeling" <skeeling221 at hotmail.com>
>>>> wrote:
>>>>>> 
>>>>>>> My name is Stephen and I use Blender every day for personal use and
>>>>>>> business. I love Blender's open interface and customization that is
>>>>>>> available. The one thing I really am hoping to see every day is an
>>> add
>>>> on
>>>>>>> or system update that supports exporting or saving my blend file
>> into
>>>> a PSD
>>>>>>> instead of tiff or jpg or png. Adding a Photoshop add on or system
>>>> update
>>>>>>> would be extremely helpful!!!! For my business, I normally need to
>>>> convert
>>>>>>> every project into CMYK for print and that is where the colors of
>> the
>>>> RGB
>>>>>>> jpg are really screwed up and I spend hours recoloring my entire
>>>> Blender
>>>>>>> creation. Creating a PSD export would bypass all of this time and
>>> would
>>>>>>> help when trying to print any creation made in Blender.
>>>>>>> Thank you for your time and please consider this simple
>> add-on!!!!!!
>>>>>>> _______________________________________________
>>>>>>> Bf-committers mailing list
>>>>>>> Bf-committers at blender.org
>>>>>>> https://lists.blender.org/mailman/listinfo/bf-committers
>>>>>>> 
>>>>>> _______________________________________________
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>>>> 
>>>> --
>>>> 
>>>> Jens Verwiebe
>>>> Allerskehre 44 - 22309 Hamburg
>>>> 
>>>> Tel.: +49 40 67 78 50
>>>> mobile: +49 172 400 49 07
>>>> mailto: info at jensverwiebe.de
>>>> web: http://www.jensverwiebe.de
>>>> 
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>>> 
>>> 
>>> 
>>> --
>>> Douglas E Knapp, MSAOM, LAc.
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