jayme del rosario | sketchblog

“Field effect” is a characteristic of color (any color, value, scale) wherein a color’s appearance is affected by what is adjacent to it. From my research and study, this term seems to originate from Ted Seth Jacobs. I’ve only heard the term used by those teachers of mine who have studied directly under Ted, or those who always site some connection to the Ted Seth Jacobs lineage. I mentioned in a previous post about Sarah Lamb’s still life workshop, that she covered this topic of field effect so that we could better notice, understand and see it in nature. Mostly, we discussed a specific field effect in relation to our edges.

Under certain lighting conditions, for example with front light or under a strong spotlight, with the subject against a dark background, the dark tones at the edge of an object may be absorbed into the background and what we really see in this instance is an area just inside the edge of the form instead of the dark light. The outermost edge of this zone blends into the background. This creates the illusion of softer edges instead of a crisp separation between the object and background. The basic lesson is what we’ve heard over and over again, we must pay attention to the edges and work very carefully at the meeting of forms. A great example is an image I’ve posted here before.

Notice how the edge of the shoulder as it turns into the form of the back is very soft, while the edge of the upper forearm of the left arm against a light drapery is much more crisp. We can also contrast the field effects happening in the skull and the right arm. The skull has a softer edge as the top of the head as it turns away from us toward the background and enters the dark light, while the right arm (also turning away from us into the background) is more lit and its dark light zone is not near the edge of the arm placed against the background. Thus the difference in their edge treatment. (At least this is how I rationalize my reading of how Caravaggio treated the two edges differently.) He may have just been copying what he saw, which proves that how he painted what he saw is accurate with visual phenomena. Yet, I suspect that he was aware of these patterns in nature and didn’t just copy nature by rote in his practice. (There are also other reasons why the skull has a softer edge than the right arm.)

For the painting I worked on in Sarah Lamb’s workshop, she had me pay attention to the edge of the gourd which was in the dark light region, against the darker background of the wooden box. This edge was much softer than the opposing edge more directly facing the light source against a cast shadow on the same dark wooden box.

With a backlit subject, the same field effects would occur with the opposite observation. Edges would be softer on the light edge against a light background as some of this lighter zone would be absorbed into the background and harder on the darker side of the form against the lighter background. This is also consistent with the rule that high contrast areas are often the sharpest areas in a painting/nature.

There are many different field effects in nature which I have yet to learn and fully understand. In essence, everything in our visual experience is a field effect since we never see objects in nature in isolation, especially color. The cognitive experience of visual phenomena is a product of many different optical illusions and our eyes are lying to our brains (or is it our brains lying to our eyes, therefore lying to itself? …If anyone knows of any books on this topic, please let me know and shoot me an email! I love this stuff!!).

We discussed another field effect at the edges of a form, in relation to color, which I’ll write as a separate post later this week. I’ve indulged in my musings enough for the evening (making good use of that extra hour we gained from Daylight Savings this weekend). It’s time to finish preparing my panels for this week’s intensive workshop-style class with Michael at the studio.

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Though I haven’t had any issues, I thought it wise to add the statement below:

Art Student’s/Blogger’s Caveat:
Everyone should always take this in consideration when reading any blog, but I’ll state it here just to be clear. Everything written on my personal blog is my interpretation of my studies and in no way should be taken as the exact teaching itself. Though I strive to understand and represent all the concepts fully and back up my writing/notes with examples, other more established posts/articles/books, science, visual phenomena, etc. there is always room for error and misunderstanding so it is the reader’s responsibility to cross-reference anything they read here. In case of any error brought to my attention, I will always point them out ASAP. (And of course, if you’ve heard otherwise or spot any incongruities, please shoot me an email since I created this blog to develop a greater, ongoing conversation amongst like-minded people and artists.)