Re: Photoshop Plugin importing as RGB/16 bit
Chris Cox <[email protected]> Thu, 4 Jun 2009 18:37:24 -0700
| Newsgroups | gmane.comp.video.openexr.user |
|---|---|
| Message-ID | <C64DC4E4.80221%[email protected]> |
--===============1858384078== Content-Language: en Content-Type: multipart/alternative; boundary="_000_C64DC4E480221ccoxadobecom_" --_000_C64DC4E480221ccoxadobecom_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Ray; Photoshop is a straight color application, and OpenEXR is defined as being = premultiplied. This means that OpenEXR data has to be un-multiplied by the= transparency/opacity values to work in Photoshop. To a straight color app= lication, there is no meaning to color values when the opacity is zero. If= the opacity is non-zero, then the color values are there - just un-multip= lied so they will composite correctly. Photoshop already handles the EXR "A" channel (defined in the spec as opaci= ty/transparency data) correctly - it opens it as opacity/transparency. What the Photoshop EXR plugin does not do is give you a way to open the tra= nsparency channel as an arbitrary alpha channel, or to open channels other = than RGBA. I'm sorry I don't have a solution for you, but your post sounded like you w= ere confused about the terminology and what was happening to your data (eno= ugh so that I still don't know what's not working for you with the Photosho= p EXR plugin). Chris On 6/4/09 4:23 PM, "[email protected]" <[email protected]> wrote: I'm working on a project that is rendering 32bit floating bit EXR files out= of 3DStudio. I'm then compiling these frames in After Effects in a 32 bit= floating point composite and it's all working fine. The problem I'm havin= g is that I also need to composite some scenes in Photoshop CS4, and the de= fault Photoshop EXR plugin is tossing out any data from the image that has = a transparent alpha. I found the Photoshop plugin on the OpenEXR website a= nd had hopes that it would do what I needed. Thankfully it knows how to ha= ndle the alpha channel properly, but unfortunately the plugin imports the i= mage into a 16bit integer document and any value above 1.0 is clipped. I c= an't use the exposure adjustment to access the over bright details. Becaus= e of these import problems I have to run each image through After Effects a= nd do the exposure processing there, then export an image to Photoshop. Can the maintainer of the OpenEXR photoshop plugin please recompile a new v= ersion that imports images into a 32bit document and maintain the full colo= r range, or provide exposure controls in the plugin? Also, I could use a 6= 4bit version of the plugin for the 64bit version of Photoshop. Thanks, Ray Collett -- =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D --=3D=3D-- Ray Collett --=3D=3D-- Technical Director; Newlands & Company Inc. www.nc3d.com =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D _______________________________________________ Openexr-user mailing list [email protected] http://lists.nongnu.org/mailman/listinfo/openexr-user --_000_C64DC4E480221ccoxadobecom_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable <HTML> <HEAD> <TITLE>Re: [Openexr-user] Photoshop Plugin importing as RGB/16 bit</TITLE> </HEAD> <BODY> <FONT FACE=3D"Myriad Pro"><SPAN STYLE=3D'font-size:10pt'>Ray;<BR> <BR> Photoshop is a straight color application, and OpenEXR is defined as being = premultiplied. This means that OpenEXR data has to be un-multiplied b= y the transparency/opacity values to work in Photoshop. To a straight= color application, there is no meaning to color values when the opacity is= zero. If the opacity is non-zero, then the color values are there - = just un-multiplied so they will composite correctly.<BR> <BR> Photoshop already handles the EXR “A” channel (defined in the s= pec as opacity/transparency data) correctly – it opens it as opacity/= transparency.<BR> What the Photoshop EXR plugin does not do is give you a way to open the tra= nsparency channel as an arbitrary alpha channel, or to open channels other = than RGBA.<BR> <BR> I’m sorry I don’t have a solution for you, but your post sounde= d like you were confused about the terminology and what was happening to yo= ur data (enough so that I still don’t know what’s not working f= or you with the Photoshop EXR plugin).<BR> <BR> Chris<BR> <BR> <BR> <BR> On 6/4/09 4:23 PM, "<a href=3D"[email protected]">[email protected]</a>" &l= t;<a href=3D"[email protected]">[email protected]</a>> wrote:<BR> <BR> </SPAN></FONT><BLOCKQUOTE><FONT FACE=3D"Myriad Pro"><SPAN STYLE=3D'font-siz= e:10pt'>I'm working on a project that is rendering 32bit floating bit EXR f= iles out of 3DStudio. I'm then compiling these frames in After Effect= s in a 32 bit floating point composite and it's all working fine. The= problem I'm having is that I also need to composite some scenes in Photosh= op CS4, and the default Photoshop EXR plugin is tossing out any data from t= he image that has a transparent alpha. I found the Photoshop plugin o= n the OpenEXR website and had hopes that it would do what I needed. T= hankfully it knows how to handle the alpha channel properly, but unfortunat= ely the plugin imports the image into a 16bit integer document and any valu= e above 1.0 is clipped. I can't use the exposure adjustment to access= the over bright details. Because of these import problems I have to = run each image through After Effects and do the exposure processing there, = then export an image to Photoshop.<BR> <BR> Can the maintainer of the OpenEXR photoshop plugin please recompile a new v= ersion that imports images into a 32bit document and maintain the full colo= r range, or provide exposure controls in the plugin? Also, I could us= e a 64bit version of the plugin for the 64bit version of Photoshop.<BR> <BR> Thanks,<BR> Ray Collett<BR> <BR> --<BR> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D<BR> --=3D=3D-- &nbs= p; Ray Collett &= nbsp; --=3D=3D--<BR> Technical Director; Newlands & Company Inc. www.nc3d.com<BR> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D<BR> <BR> <BR> _______________________________________________<BR> Openexr-user mailing list<BR> <a href=3D"[email protected]">[email protected]</a><BR> <a href=3D"http://lists.nongnu.org/mailman/listinfo/openexr-user">http://li= sts.nongnu.org/mailman/listinfo/openexr-user</a><BR> <BR> </SPAN></FONT></BLOCKQUOTE> </BODY> </HTML> --_000_C64DC4E480221ccoxadobecom_-- --===============1858384078== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ Openexr-user mailing list [email protected] http://lists.nongnu.org/mailman/listinfo/openexr-user --===============1858384078==--