Fresh, new look for my B&W vision

480sparky · Joined: 16 Apr 2013 Posts: 355 Location: Iowa

For a long time, I've been searching for that 'perfect' B&W conversion for my images. I have always wanted a process that had contrast, fine detail,….. yet a bit of 'grunge' look to it that sort of mimics film grain. I've tried a lot of processes, but none have ever really left me satisfied.

Until a couple weeks ago. Rambling around the innernets, I stumbled across an article about B&W conversion techniques with GIMP. I thought I had exhausted all the options there but I was proven wrong.

Buried deep in the innards of GIMP is a plug-in that is a vestigal left-over from it's early developing days. Fact is, I was fully aware of it being there, but had never fully explored all the options. Under the Tool menu is a GEGL Operations…. option. (GEGL is an acronym for GEneric Graphics Language) Another window will pop up, and you can choose from about 20 rather cryptic option. I had dabbled with some of 'em, but they mostly seemed useless. For instance, "Color" merely filled the image with a chosen color. Oh, whoop-de-do! "Grey" converted most of the image to black, with random vertical bars with gray patterns in it. Fractals was sorta fun to play with, but I didn't see any practical use for my type of work. But for the most part, I quickly dismissed everything in the GEGL Operations drop-down menu choices. Most of the choices are much more readily accessible under other Menu items, and work much faster and better there.

One of the more puzzling choices was c2g. I must admit, I don't ever recall clicking on that to see what happened. Boy, I wish I had years ago.

c2g is an acronym for Color (to) Grayscale. Now, this isn't just any ordinary desaturation routine. It's more like tonemapping the colors of an image and using the results to generate the grayscale RGB for a given pixel. It’s hard to describe, and there’s precious little out there in the vast innernets world to explain it. What does exist is full of techno-babble gobbledeegoop that few understand.

Suffice it to say, this long-forgotten old-school method is quickly becoming one of my favorite B&W conversions. It’s not suited for every image, but I’m discovering it works for most of the images in my archive that I was still in search of a ‘proper process’ for.

Once you open the c2g window, there’s three sliders, labeled Radius, Samples and Iterations. I have yet to find anything online that explains their functions. Suffice it to say, the default choices (300, 4 and 10) will most likely render an image that will make you puke. It typically looks like an HDR gone terribly, horribly and totally wrong….. black shadows, halos to beat the band, and poor tonal rendering in the mid-range. But I decided to take the advice found on the site that caused me to revisit the function and try other settings.

Here’s what I found: The larger (in pixels) your image it, the more you need to increase the 3 settings. For instance, a 2000x1500 pixel might be fine at 800, 6 and 10 (respectively), but a larger image that comes from my D600 may require me to go to 1500, 12 and 15 to garner the look I’m after. So my Radius setting usually is between 800-1500 (depending on the image size), Samples is 6-12 and Iterations is set from 10-15.

A word of warning here: The process is both a total pig on your computer’s resources (meaning, you’ll likely notice everything else slows down or even halts for a while), plus it’s painstakingly s------l-----o------o------o-------o--------------w. Honestly, it can take up to 10 minutes to work it’s way through a single image.

Despite all it’s shortcomings, I’m finding it’s as close to what I have been looking for in a B&W/monochrome/desaturation process as I’ve ever seen.

I know a lot of folks look down their noses and GIMP, and some will view such an ancient, obscure and undocumented process as unworthy of their work. But that’s the beauty of photography…. If it works for me, I’m all for it!

With that, I offer up 15 images for your perusal and comments:

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4

5

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14

15

In short, given that GIMP is free, it might be worth downloading it just to try this process out!

Lloydy · Expire: 2022-01-01

Pictures like 5 & 14 - where there is old weathered wood - show good detail and tones. I dislike gimp immensely, I found it the most frustrating thing I'd ever tried so I removed it from my computer. But that looks good, I might try it again.

480sparky · Joined: 16 Apr 2013 Posts: 355 Location: Iowa

pavko · Joined: 31 Jan 2011 Posts: 216 Location: PL

Thanks for the tip. I've checked it now and it gives promising results. Far better than film simulation one.

fuzzywuzzy · Expire: 2013-11-30

Nice results, thanks for posting.

I tried a couple of my images but it's going to take a while to experiment you weren't kidding about slow Shocked

patrickh · Expire: 2011-11-18

wow and thanks

patrickh

Orio · Expire: 2012-12-04

What you show looks very good. If the program runs on windows, I may have to give it a try. Thanks for sharing the knowledge.

miran · Joined: 01 Aug 2012 Posts: 1364 Location: Slovenia

Wonderful results! I think I might have read the same article, but I didn't get such good results with my photos. Will try again. Smile

By the way, I've been using the GIMP exclusively for PP for many years now and I had no idea this features existed. Surprised

eddieitman · Joined: 12 Apr 2011 Posts: 1246 Location: United Kingdom

These look great will have to install again and check it out

kds315* · Expire: 2021-03-09

Looks fine to me, some are really good! Nice find, thanks for sharing..

Katastrofo · Expire: 2013-11-19

Excellent work, especially like the Selmer Mark VI alto sax.

Bunter · Joined: 31 Jan 2014 Posts: 1 Location: Colchester. UK

Great discovery, just had a quick go, great stuff.

RSalles · Posted: Sat Feb 01, 2014 12:05 am Post subject: