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From: Larry Gritz <lg@larrygritz.com>
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Date: Fri, 11 May 2018 08:51:06 -0700
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Subject: Re: [Tiff] Question about transfer function
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On May 11, 2018, at 5:24 AM, Graeme Gill <graeme2@argyllcms.com =
<mailto:graeme2@argyllcms.com>> wrote:
>=20
>> Of course they should. Remind me again which TIFF tag is for ACES?  =
:-)
>=20
> Yes. If it doesn't exist, perhaps one could be proposed ?


Notwithstanding the fact that half the traffic on this mail list is =
dedicated to lamenting how there is no officially recognized way to =
register new tags (and even if there was, we would be dealing with =
legacy files lacking the information for many years)...

My much more modest wish would simply be to have a string ColorSpace =
tag, that names an externally-referenced color configuration. While I =
understand the desire to support a fully embedded arbitrary transfer =
function, for most uses in a closed pipeline it seems wasteful to be =
required to fully embed what may be many MB of LUTs in every image file =
separately, especially when most files are either a canonical choice =
like "ACEScg_linear" or "sRGB", or a name in the facility's OCIO =
configuration.

Oh, and my second most-wished item for TIFF files would be a tag that =
let you name the channels of an image. (Aside: is it reasonable to use =
the InkNames tag for this? Even in a non-SEPARATED image?)

--
Larry Gritz
lg@larrygritz.com





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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dus-ascii"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" class=3D"">On =
May 11, 2018, at 5:24 AM,&nbsp;<span class=3D"" style=3D"font-family: =
Menlo-Regular; font-size: 12px; float: none; display: inline =
!important;">Graeme Gill &lt;</span><a =
href=3D"mailto:graeme2@argyllcms.com" class=3D"" style=3D"font-family: =
Menlo-Regular; font-size: 12px;">graeme2@argyllcms.com</a><span class=3D""=
 style=3D"font-family: Menlo-Regular; font-size: 12px; float: none; =
display: inline !important;">&gt;</span>&nbsp;wrote:<br =
class=3D""><div><blockquote type=3D"cite" class=3D""><br =
class=3D"Apple-interchange-newline"><div class=3D""><blockquote =
type=3D"cite" style=3D"font-family: Menlo-Regular; font-size: 12px; =
font-style: normal; font-variant-caps: normal; font-weight: normal; =
letter-spacing: normal; orphans: auto; text-align: start; text-indent: =
0px; text-transform: none; white-space: normal; widows: auto; =
word-spacing: 0px; -webkit-text-size-adjust: auto; =
-webkit-text-stroke-width: 0px; text-decoration: none;" class=3D"">Of =
course they should. Remind me again which TIFF tag is for ACES? =
&nbsp;:-)<br class=3D""></blockquote><br style=3D"caret-color: rgb(0, 0, =
0); font-family: Menlo-Regular; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none;" class=3D""><span style=3D"caret-color: rgb(0, 0, =
0); font-family: Menlo-Regular; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none; float: none; display: inline !important;" =
class=3D"">Yes. If it doesn't exist, perhaps one could be proposed =
?</span><br style=3D"caret-color: rgb(0, 0, 0); font-family: =
Menlo-Regular; font-size: 12px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: =
none;" class=3D""></div></blockquote></div><div class=3D""><br =
class=3D""></div>Notwithstanding the fact that half the traffic on this =
mail list is dedicated to lamenting how there is no officially =
recognized way to register new tags (and even if there was, we would be =
dealing with legacy files lacking the information for many years)...<div =
class=3D""><br class=3D""></div><div class=3D"">My much more modest wish =
would simply be to have a string ColorSpace tag, that names an =
externally-referenced color configuration. While I understand the desire =
to support a fully embedded arbitrary transfer function, for most uses =
in a closed pipeline it seems wasteful to be required to fully embed =
what may be many MB of LUTs in every image file separately, especially =
when most files are either a canonical choice like "ACEScg_linear" or =
"sRGB", or a name in the facility's OCIO configuration.</div><div =
class=3D""><br class=3D""></div><div class=3D"">Oh, and my second =
most-wished item for TIFF files would be a tag that let you name the =
channels of an image. (Aside: is it reasonable to use the InkNames tag =
for this? Even in a non-SEPARATED image?)</div><div class=3D""><br =
class=3D""></div><div class=3D""><div class=3D""><div class=3D"">
<div style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; =
-webkit-line-break: after-white-space;" class=3D""><div style=3D"color: =
rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: =
normal; font-variant-caps: normal; font-weight: normal; letter-spacing: =
normal; text-align: start; text-indent: 0px; text-transform: none; =
white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: =
0px;">--</div><div style=3D"color: rgb(0, 0, 0); font-family: Helvetica; =
font-size: 14px; font-style: normal; font-variant-caps: normal; =
font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px;">Larry =
Gritz</div><div style=3D"color: rgb(0, 0, 0); font-family: Helvetica; =
font-size: 14px; font-style: normal; font-variant-caps: normal; =
font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px;"><a =
href=3D"mailto:lg@larrygritz.com" =
class=3D"">lg@larrygritz.com</a></div><div style=3D"color: rgb(0, 0, 0); =
font-family: Helvetica; font-size: 14px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=3D""><br=
 class=3D""></div><br class=3D"Apple-interchange-newline"></div><br =
class=3D"Apple-interchange-newline">
</div>
<br class=3D""></div></div></body></html>=

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_______________________________________________
Tiff mailing list: Tiff@lists.maptools.org
http://lists.maptools.org/mailman/listinfo/tiff
http://www.remotesensing.org/libtiff/
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