Friday 5 September 2008

Forging a Damien Hirst

How much information is there in one of Damien Hirst's spot painting?

I was prompted to think again about Damien Hirst by the news of his plan to auction some of his artwork directly, bypassing the dealers.

Consider one of his spot paintings: Lysergic Acid Diethylamide (LSD). There's been a lot said about these paintings, but I want to think about their information content.

It is easy to generate an image of this painting, or something similar, on the computer. I've been playing with this.

1) Drawing an image in Adobe Illustrator. I had a go at this, aiming to match (approximately) the relative dimensions (ratio between spot diameters and spot spacing) and getting a rough match of the colours. I saved it as a jpeg file using the settings for maximum quality, which gave a file size of 110 kbytes. I've pasted it below.

At minimum quality, the files size is only 14 kbytes, but the quality is significantly reduced:

2) I then wrote a VBA macro to generate a similar image in microsoft powerpoint (I'm just using tools that I have ready to hand). Here is the complete macro to generate a diagram with the same dimensions, but randomly colouring the circles:

Sub draw_lots_spots()
col_start_pos = 25
row_start_pos = 25
For rownum = 0 To 10
For colnum = 0 To 12
col_pos = col_start_pos + colnum * 45
row_pos = row_start_pos + rownum * 45
red = Int(256 * Rnd)
green = Int(256 * Rnd)
blue = Int(256 * Rnd)
ActiveWindow.Selection.SlideRange.Shapes.AddShape(msoShapeOval, col_pos, row_pos, 24, 24).Select
With ActiveWindow.Selection.ShapeRange
.Fill.Visible = msoTrue
.Fill.ForeColor.RGB = RGB(red, green, blue)
.Fill.Transparency = 0#
.Line.Visible = msoFalse
End With
Next colnum
Next rownum
End Sub

Saved as a text file, it is 598 bytes. (Paste this text into a VBA module in PowerPoint, then run the "draw_lots_spots" macro from a blank slide and you'll get the spots.)

3) Finally, I wrote a similar macro but combined it with a data file that contained the RGB parameters for the colours of each circle. The macro text file in this case was 636 bytes, while the data file with the colour information was 1676 bytes. Combining the macro and its data in a zip file, gave a total compressed file size of 1344 bytes.

So, what does all this say? There is a sense in which I've got an image of Hirst's LSD painting down to 1344 bytes (on the grounds that the choice of colours must have been significant). This is 'algorithmic information', and it's not many bytes - a lot fewer than required for 1919 for example. Of course, I am aware that this little image on the computer is a long way from the real meter-square painting. I'm imagining using this, from the computer, as a recipe for doing a real painting. So you could add to the VBA macro the instruction "Copy this enlarged to 106.5 cm x 127 cm using gloss paint on canvas" (or whatever was used), then you have an algorithm for getting something like the original. I don't know enough about the technique to know how close this would get you to the original. I suspect those who know might deride my suggestion that it gets you anywhere near, but it would surely get you some way towards it.

Compare this to Degas's The Bellelli Family that I discussed earlier. I can't think of any way that an algorithm could be used to construct anything resembling the painting. Compressing using JPEG, I reckon that about the minumum file size that gives you anything remotely useful is about 14 kbytes, which gives the following (I'm assuming no-one is going to worry about copyright issues with a copy - which is from the Independent article - of this poor quality)

Actually, I'm not quite sure where this argument is going. I'd had in mind that I would be able to say something along the lines of Hirst's painting containing so much less information, and that therefore the value of Hirst's is almost entirely in the context, whereas Degas's contained lots of information within the painting. I'm not sure that is coming out quite so clearly.

Enough for now. [More on this in a later post.]

1 comment:

DaveoftheNewCity said...
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