Poor-man’s sepia conversion13 Oct 2004
Working for Pixagogo makes digital imagery my daily bread, and I fool around with images every now and then. I am, however, not a user of PhotoShop. I’ve never worked with it, I don’t own the software, nada. Keep that in mind while you continue reading this.
Recently, for my cousin’s filmfilostoverij blog, I converted some film snapshots into small thumbnails like the one on the right (from “Lucia y el sexo”). The program I use for conversion is IrfanView. Not the best program, not the most complete, but easy, stable and free. For the stuff I need to do, I find Gimp too complex.
What I did to the images was:
- crop a square part of it
- convert to grayscale
- resize to 400×400 px
- perform a median filter (value: 9)
- resize to 100×100 px
- Save as JPG
But then I wanted to have a ‘sepia‘ effect. Irfanview does not have it. I wanted it. So I began my quest.
I started with the ‘Enhance Colors’ function and added 64 ‘R’ and 16 ‘G’ to the B/W image, but that didn’t look real enough. What does sepia look like, anyway? I found two definitions, expressed in CMYK coordinates, that I converted to RGB with my CMYK-to-RGB converter hizmo (thanks to Wikipedia):
|In ‘websafe‘ colors, this would be:|
So let me show you how I proceeded, using an image of my tango teachers, Marisa y Oliver: