A quick read up on Gorman-Holbert conversion claimed this was basically taking just the luminance info from LAB mode and then darkening the result with a multiply blend.
My guess is that the monochrome module (like most dt modules) operates natively in LAB mode and essentially uses the same process of throwing away colour info for monochrome conversion. We then have blendops to access a wide range of tonal effects - like your process and the photoshop tutorial I glanced at does. At first sight this sort of process seems much more suited to dt operating natively in LAB mode than PS having to convert back and forth from LAB to RGB, or so it seems to me. Rgds, Rob. -----Original Message----- From: Rodrigo Amestica [mailto:[email protected]] Sent: 17 September 2013 12:30 To: [email protected] Subject: [Darktable-users] Gorman-Holbert Conversion Method Hi, for some days I have been trying to duplicate that black and white conversion method in darktable. Internet resources are plenty on descriptions based on photoshop. I think that a procedure shown below does the work: 1. completely desaturate using a module like color correction 2. create a duplicated instance of the module just used in #1 (it must go after in the pixelpipeline) 3. in instance #2 set blend mode to multiply 4. set parametric blend mode 5. invert polarity of the 'input' parametric slider However, what I have found is that the result of the above procedure is very very close to darktable's monochrome module with just default parameters. I'm puzzled by the so close results. Just wondering why the result are so similar. Would any body make a guess? Thanks, Rodrigo ------------------------------------------------------------------------------ LIMITED TIME SALE - Full Year of Microsoft Training For Just $49.99! 1,500+ hours of tutorials including VisualStudio 2012, Windows 8, SharePoint 2013, SQL 2012, MVC 4, more. BEST VALUE: New Multi-Library Power Pack includes Mobile, Cloud, Java, and UX Design. Lowest price ever! Ends 9/20/13. http://pubads.g.doubleclick.net/gampad/clk?id=58041151&iu=/4140/ostg.clktrk _______________________________________________ Darktable-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/darktable-users This email is confidential and is intended for the addressee only. If you are not the addressee, please delete the email and do not use it in any way. Please note that any views or opinions presented in this email are solely those of the author and do not necessarily represent those of the company. NHBC reserves the right to monitor all email communications. The recipient should check this email and any attachments for the presence of viruses. The company accepts no liability for any damage caused by any virus transmitted by this email. NHBC, the National House-Building Council, is limited by guarantee in England, No 320784. Registered address: NHBC House, Davy Avenue, Knowlhill, Milton Keynes MK5 8FP. NHBC is authorised by the Prudential Regulation Authority and regulated by the Financial Conduct Authority and Prudential Regulation Authority. NHBC Building Control Services Ltd, registered by guarantee in England with Company No. 01952969. Registered address: NHBC House, Davy Avenue, Knowlhill, Milton Keynes MK5 8FP. NHBC Services Ltd registered by guarantee in England, No 03067703. Registered address: NHBC House, Davy Avenue, Knowlhill, Milton Keynes MK5 8FP. If you make a claim under a Buildmark policy your personal details will be stored and processed in accordance with the Data Protection Act. Your personal details may be passed to others involved with your claim such as the original builder, or a consultant or remedial works contractor that we may employ in connection with your claim(s) and matter ancillary to your claim(s). Other than disclosure provided for in this statement, we will not pass any data about you to any other party without your permission unless we are required to do so by law. ------------------------------------------------------------------------------ LIMITED TIME SALE - Full Year of Microsoft Training For Just $49.99! 1,500+ hours of tutorials including VisualStudio 2012, Windows 8, SharePoint 2013, SQL 2012, MVC 4, more. BEST VALUE: New Multi-Library Power Pack includes Mobile, Cloud, Java, and UX Design. Lowest price ever! Ends 9/20/13. http://pubads.g.doubleclick.net/gampad/clk?id=58041151&iu=/4140/ostg.clktrk _______________________________________________ Darktable-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/darktable-users
