# Dichroic separate RGB channel DSLR scaning **URL:** \ **Category:** Digital Camera Scanning\ **Created:** [May 16, 2024, 10:25am UTC](https://forums.negativelabpro.com/t/dichroic-separate-rgb-channel-dslr-scaning/7802 "2024-05-16T10:25:29Z")\ **Posts on this page:** 20\ **Page:** 1
**Author:** ![Hansha](https://yyz1.discourse-cdn.com/flex029/user_avatar/forums.negativelabpro.com/hansha/32/1037_2.png) [@Hansha](https://forums.negativelabpro.com/u/Hansha)\ **Post date:** [May 16, 2024, 10:25am UTC](https://forums.negativelabpro.com/t/dichroic-separate-rgb-channel-dslr-scaning/7802/1 "2024-05-16T10:25:29Z")
Has anyone experiemted with things like dichroic filter RGB DSLR scaning? Or perhpas creating a IR channel with the removal of IR cutoff filter in the camera? Thank for sharing your experiences. R. ---
**Author:** ![Harry](https://avatars.discourse-cdn.com/v4/letter/h/f6c823/32.png) [@Harry](https://forums.negativelabpro.com/u/Harry)\ **Post date:** [May 16, 2024, 12:51pm UTC](https://forums.negativelabpro.com/t/dichroic-separate-rgb-channel-dslr-scaning/7802/2 "2024-05-16T12:51:47Z")
There’s a rather old thread here: > [@Dichro color head for light source](https://forums.negativelabpro.com/t/dichro-color-head-for-light-source/3076): > > Is there an ideal light source for old emulsions. It seems like we should separate the density record in the film from the color of the (faded) dyes. Of course the camera has filters on the sensor for color separation. Has anyone experimented with a dichroic enlarging head to sharpen the cutoffs? ---
**Author:** ![DavidHoffmanuk](https://yyz1.discourse-cdn.com/flex029/user_avatar/forums.negativelabpro.com/davidhoffmanuk/32/909_2.png) [@DavidHoffmanuk](https://forums.negativelabpro.com/u/DavidHoffmanuk)\ **Post date:** [May 17, 2024, 4:42pm UTC](https://forums.negativelabpro.com/t/dichroic-separate-rgb-channel-dslr-scaning/7802/3 "2024-05-17T16:42:46Z")
I’ve been using a Nikon D800 on a modified Beseler Duplicator Deluxe (built on an inverted enlarger head) for a good few years now & the colour filters work well. I always do my final colour correction in Photoshop. Mostly little is needed although really major colour changes are possible so I don’t fuss too much, I just have standard settings for transparencies & for C41. ---
**Author:** ![Hansha](https://yyz1.discourse-cdn.com/flex029/user_avatar/forums.negativelabpro.com/hansha/32/1037_2.png) [@Hansha](https://forums.negativelabpro.com/u/Hansha)\ **Post date:** [May 18, 2024, 7:24am UTC](https://forums.negativelabpro.com/t/dichroic-separate-rgb-channel-dslr-scaning/7802/4 "2024-05-18T07:24:59Z")
Thank you for alerting me to that! ---
**Author:** ![Hansha](https://yyz1.discourse-cdn.com/flex029/user_avatar/forums.negativelabpro.com/hansha/32/1037_2.png) [@Hansha](https://forums.negativelabpro.com/u/Hansha)\ **Post date:** [May 18, 2024, 7:25am UTC](https://forums.negativelabpro.com/t/dichroic-separate-rgb-channel-dslr-scaning/7802/5 "2024-05-18T07:25:33Z")
Do you see any improvement over single pass RGB scan? ---
**Author:** ![DavidHoffmanuk](https://yyz1.discourse-cdn.com/flex029/user_avatar/forums.negativelabpro.com/davidhoffmanuk/32/909_2.png) [@DavidHoffmanuk](https://forums.negativelabpro.com/u/DavidHoffmanuk)\ **Post date:** [May 18, 2024, 8:16am UTC](https://forums.negativelabpro.com/t/dichroic-separate-rgb-channel-dslr-scaning/7802/6 "2024-05-18T08:16:20Z")
A digital exposure is always & only a single pass exposure. I sometimes make 2 or 3 different exposures to HDR a high contrast original. ---
**Author:** ![Hansha](https://yyz1.discourse-cdn.com/flex029/user_avatar/forums.negativelabpro.com/hansha/32/1037_2.png) [@Hansha](https://forums.negativelabpro.com/u/Hansha)\ **Post date:** [May 18, 2024, 8:33am UTC](https://forums.negativelabpro.com/t/dichroic-separate-rgb-channel-dslr-scaning/7802/7 "2024-05-18T08:33:23Z")
I wasn’t talking about multiple exposures but **multiple passes** as in multiple shots being roughly equivalent multiple linear sensor passes. ---
**Author:** ![DavidHoffmanuk](https://yyz1.discourse-cdn.com/flex029/user_avatar/forums.negativelabpro.com/davidhoffmanuk/32/909_2.png) [@DavidHoffmanuk](https://forums.negativelabpro.com/u/DavidHoffmanuk)\ **Post date:** [May 18, 2024, 8:51am UTC](https://forums.negativelabpro.com/t/dichroic-separate-rgb-channel-dslr-scaning/7802/8 "2024-05-18T08:51:17Z")
I don’t know what you mean by ‘passes’ when using a camera to digitise. ---
**Author:** ![Harry](https://avatars.discourse-cdn.com/v4/letter/h/f6c823/32.png) [@Harry](https://forums.negativelabpro.com/u/Harry)\ **Post date:** [May 18, 2024, 8:59am UTC](https://forums.negativelabpro.com/t/dichroic-separate-rgb-channel-dslr-scaning/7802/9 "2024-05-18T08:59:59Z")
Do you mean that you attempt to neutralise the orange mask for colour negative by adding broadly cyan filtration? If so have you found that effective? ---
**Author:** ![Harry](https://avatars.discourse-cdn.com/v4/letter/h/f6c823/32.png) [@Harry](https://forums.negativelabpro.com/u/Harry)\ **Post date:** [May 18, 2024, 9:07am UTC](https://forums.negativelabpro.com/t/dichroic-separate-rgb-channel-dslr-scaning/7802/10 "2024-05-18T09:07:48Z")
I’m wondering if you might be referring to use a dichroic enlarger to try and produce separate RGB exposures, I’m not sure that would be possible, the only solutions that I’ve seen use individually controlled (and specially selected) LEDs as in this thread: > [@Integrating sphere as a uniform backlight](https://forums.negativelabpro.com/t/integrating-sphere-as-a-uniform-backlight/6302/8): > > I am using a Nikor/Honeywell 6x7 colour enlarger head as a light source for my camera scanning setup. The enlarger heads light is an MR16 Halogen bulb, it shines into a wedge-shaped box which is metal, painted white, and has what looks to be styrofoam lining the inside, it then shines down through some translucent white plastic material which further diffuses the light. So it does what your globe does. My question is, how well then does the Halogen bulb work in terms of getting good colour info… ---
**Author:** ![DavidHoffmanuk](https://yyz1.discourse-cdn.com/flex029/user_avatar/forums.negativelabpro.com/davidhoffmanuk/32/909_2.png) [@DavidHoffmanuk](https://forums.negativelabpro.com/u/DavidHoffmanuk)\ **Post date:** [May 18, 2024, 9:16am UTC](https://forums.negativelabpro.com/t/dichroic-separate-rgb-channel-dslr-scaning/7802/11 "2024-05-18T09:16:25Z")
From memory, for C41 I’ve been using Y36, M0, C44 but the illumination is from an underrun (so quite yellow) tungsten lamp so other illuminants would need very different settings. ---
**Author:** ![Hansha](https://yyz1.discourse-cdn.com/flex029/user_avatar/forums.negativelabpro.com/hansha/32/1037_2.png) [@Hansha](https://forums.negativelabpro.com/u/Hansha)\ **Post date:** [May 18, 2024, 9:46am UTC](https://forums.negativelabpro.com/t/dichroic-separate-rgb-channel-dslr-scaning/7802/12 "2024-05-18T09:46:07Z")
I meant making 3 photos – R, G and B separately and compositing the channels in PS … ---
**Author:** ![Hansha](https://yyz1.discourse-cdn.com/flex029/user_avatar/forums.negativelabpro.com/hansha/32/1037_2.png) [@Hansha](https://forums.negativelabpro.com/u/Hansha)\ **Post date:** [May 18, 2024, 9:47am UTC](https://forums.negativelabpro.com/t/dichroic-separate-rgb-channel-dslr-scaning/7802/13 "2024-05-18T09:47:43Z")
Halogen is great in terms of Colour rendering index. ---
**Author:** ![Harry](https://avatars.discourse-cdn.com/v4/letter/h/f6c823/32.png) [@Harry](https://forums.negativelabpro.com/u/Harry)\ **Post date:** [May 18, 2024, 10:19am UTC](https://forums.negativelabpro.com/t/dichroic-separate-rgb-channel-dslr-scaning/7802/14 "2024-05-18T10:19:26Z")
Oh yes, though as that post suggests maybe a bit warm for conversion with a digital camera so some filtration is possibly preferable as with @DavidHoffmanuk above. I was thinking that you might mean combining 3 different exposures with different filtration dialled in. Clearly colour printing paper was used with a tungsten light source in an enlarger but it was designed that way. ---
**Author:** ![Harry](https://avatars.discourse-cdn.com/v4/letter/h/f6c823/32.png) [@Harry](https://forums.negativelabpro.com/u/Harry)\ **Post date:** [May 18, 2024, 10:20am UTC](https://forums.negativelabpro.com/t/dichroic-separate-rgb-channel-dslr-scaning/7802/15 "2024-05-18T10:20:51Z")
Sorry, just read this, so you did mean 3 separate exposures! Never read of anyone doing that, it’s difficult enough with individually controlled LEDs I think. ---
**Author:** ![Harry](https://avatars.discourse-cdn.com/v4/letter/h/f6c823/32.png) [@Harry](https://forums.negativelabpro.com/u/Harry)\ **Post date:** [May 18, 2024, 10:23am UTC](https://forums.negativelabpro.com/t/dichroic-separate-rgb-channel-dslr-scaning/7802/16 "2024-05-18T10:23:01Z")
Thanks, I wondered if that was the basic principle and presumably you’ve found it beneficial over no filtration, pure tungsten as it were. ---
**Author:** ![DavidHoffmanuk](https://yyz1.discourse-cdn.com/flex029/user_avatar/forums.negativelabpro.com/davidhoffmanuk/32/909_2.png) [@DavidHoffmanuk](https://forums.negativelabpro.com/u/DavidHoffmanuk)\ **Post date:** [May 18, 2024, 11:45am UTC](https://forums.negativelabpro.com/t/dichroic-separate-rgb-channel-dslr-scaning/7802/17 "2024-05-18T11:45:49Z")
It does give a file that converts well & is mostly usable (news, books & mags but not exhibition or print sales) straight from NLP with no additional correction. When I’ve been digitising BW & forget to switch the filtration in I get very orange files but even those can be easily fixed in P’shop. Same with transparencies that come out very blue, surprisingly easy to sort out later. It’s just quicker to get it close straight off - & quick is what I like as this is a production setup so time is a major consideration. ---
**Author:** ![DavidHoffmanuk](https://yyz1.discourse-cdn.com/flex029/user_avatar/forums.negativelabpro.com/davidhoffmanuk/32/909_2.png) [@DavidHoffmanuk](https://forums.negativelabpro.com/u/DavidHoffmanuk)\ **Post date:** [May 18, 2024, 11:46am UTC](https://forums.negativelabpro.com/t/dichroic-separate-rgb-channel-dslr-scaning/7802/18 "2024-05-18T11:46:46Z")
I’ve never tried that. Why would you? ---
**Author:** ![Hansha](https://yyz1.discourse-cdn.com/flex029/user_avatar/forums.negativelabpro.com/hansha/32/1037_2.png) [@Hansha](https://forums.negativelabpro.com/u/Hansha)\ **Post date:** [May 20, 2024, 7:24am UTC](https://forums.negativelabpro.com/t/dichroic-separate-rgb-channel-dslr-scaning/7802/19 "2024-05-20T07:24:31Z")
If you used a monocrome DSL w/o a Bayer array you would get 3x time as much color information potentially making it comparable or suprassing scanner line scan sensors … ---
**Author:** ![Hansha](https://yyz1.discourse-cdn.com/flex029/user_avatar/forums.negativelabpro.com/hansha/32/1037_2.png) [@Hansha](https://forums.negativelabpro.com/u/Hansha)\ **Post date:** [May 20, 2024, 7:28am UTC](https://forums.negativelabpro.com/t/dichroic-separate-rgb-channel-dslr-scaning/7802/20 "2024-05-20T07:28:00Z")
A scaner makes 3 exposures with the line sensor. Using monochrome DSLR and separate color exposures could potentially benefit the scan. How much and is it viable is questionable, this is why I am asking if somone has experience with it. Servicing pro scanners is becoming a nightmare and DSLR repro scanning still can’t catch up. I heard the new Fuji 100MP medim makes great scans but thats an above 10k rig. [Next page](https://forums.negativelabpro.com/t/dichroic-separate-rgb-channel-dslr-scaning/7802.md?page=2)