Re: RGB colorspace question
Bob Friesenhahn <[email protected]> Tue, 09 Jan 2024 07:33:30 -0600
| Newsgroups | gmane.comp.video.graphicsmagick.help |
|---|---|
| Message-ID | <[email protected]> |
--===============3507701998375527304== Content-Type: multipart/alternative; boundary="----E3E379WBT7UUBTLXHG2E50DKYPOO8U" Content-Transfer-Encoding: 7bit ------E3E379WBT7UUBTLXHG2E50DKYPOO8U Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 Thanks for investigating this issue! Bob =E2=81=A3Sent from BlueMail =E2= =80=8B On Jan 9, 2024, 7:21=E2=80=AFAM, at 7:21=E2=80=AFAM, Michael Orlitz= ky <michael@orlitzky=2Ecom> wrote: >On Mon, 2024-01-08 at 15:44 -0600, Bob = Friesenhahn wrote: >> >> Besides colorspace transformation, there is also = the possibility of a > >> gamma adjustment=2E A gamma adjustment will also= cause a change in >> numeric levels=2E >> > >Hm=2E I'm still not sure wh= at the problem is, but I now have a minimal >reproducer showing that ImageM= agick is to blame: > >1=2E Create a single-pixel image with color #e1cbe1 >= 2=2E Save it as a BMP without colorspace information >3=2E Run the convert = commands >4=2E GM has it as #E1CBE1, while IM has it as #C098C0 > >So, not = your problem=2E Thanks for the help=2E > > > >_____________________________= __________________ >Graphicsmagick-help mailing list >Graphicsmagick-help@l= ists=2Esourceforge=2Enet >https://lists=2Esourceforge=2Enet/lists/listinfo/= graphicsmagick-help ------E3E379WBT7UUBTLXHG2E50DKYPOO8U Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable <html><head></head><body style=3D"zoom: 0%;"><div dir=3D"auto">Thanks for i= nvestigating this issue!<br><br></div> <div dir=3D"auto">Bob<br><br></div> = <div dir=3D"auto"><!-- tmjah_g_1299s -->Sent from <!-- tmjah_g_1299e --><a = href=3D"https://bluemail=2Eme"><!-- tmjah_g_1299s -->BlueMail<!-- tmjah_g_1= 299e --></a><!-- tmjah_g_1299s --> <!-- tmjah_g_1299e --></div> <div class= =3D"gmail_quote" >On Jan 9, 2024, at 7:21=E2=80=AFAM, Michael Orlitzky <= <a href=3D"mailto:michael@orlitzky=2Ecom" target=3D"_blank">michael@orlitzk= y=2Ecom</a>> wrote:<blockquote class=3D"gmail_quote" style=3D"margin: 0p= t 0pt 0pt 0=2E8ex; border-left: 1px solid rgb(204, 204, 204); padding-left:= 1ex;"> <pre class=3D"blue">On Mon, 2024-01-08 at 15:44 -0600, Bob Friesenh= ahn wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin: 0pt 0pt 1e= x 0=2E8ex; border-left: 1px solid #729fcf; padding-left: 1ex;"> <br> Beside= s colorspace transformation, there is also the possibility of a <br> gamma = adjustment=2E A gamma adjustment will also cause a change in <br> numeric = levels=2E<br> <br></blockquote><br>Hm=2E I'm still not sure what the proble= m is, but I now have a minimal<br>reproducer showing that ImageMagick is to= blame:<br><br>1=2E Create a single-pixel image with color #e1cbe1<br>2=2E = Save it as a BMP without colorspace information<br>3=2E Run the convert com= mands<br>4=2E GM has it as #E1CBE1, while IM has it as #C098C0<br><br>So, n= ot your problem=2E Thanks for the help=2E<br><br><br><br><hr><br>Graphicsma= gick-help mailing list<br>Graphicsmagick-help@lists=2Esourceforge=2Enet<br>= <a href=3D"https://lists=2Esourceforge=2Enet/lists/listinfo/graphicsmagick-= help">https://lists=2Esourceforge=2Enet/lists/listinfo/graphicsmagick-help<= /a><br></pre></blockquote></div></body></html> ------E3E379WBT7UUBTLXHG2E50DKYPOO8U-- --===============3507701998375527304== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline --===============3507701998375527304== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ Graphicsmagick-help mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/graphicsmagick-help --===============3507701998375527304==--