Sunflower Droste
How it’s done: Starting with a sunflower photo with a nice plain sky background I used the select by colour tool to select the background. Then by promoting the background layer to a proper layer I cut out the sky to leave the sunflower on the transparent checkerboard. On the first go with Mathmap I found the petals still had bright edges because they used to be against a bright sky, which looked wrong against the dark flower centre. So I went back so the selection stage, grew the selection by 3 pixels so it cut off the edges of the petals and then feathered it by 3 pixels. Then I cut the sky off. Now I had just the flower with gradual transparency around the edge. I grabbed a nice brown from the middle of the flower using the eyedropper and created a new layer under the flower layer filled with that colour. Then I flattened and again cut out the flower from the background using fuzzy select this time. Now at last I had a flower with a brown fringe around the edge.
Finally I stuck it in Mathmap, selected Droste and turned on ExternalTransparency because that’s what it has. Tweaked the parameters and here is the result.
Parameters: InnerRadius 29.56 OuterRadius 91 Periodicity 1.02 Strands 1 XCenterShift 2 YCenterShift -4 StartingLevel 5 ExternalTransparency on
| Make | Canon |
| Model | Canon EOS 300D DIGITAL |
| Exposure | 0.008 sec (1/125) |
| Aperture | f/9.0 |
| ISO Speed | 100 |
| Date and Time (Original) | 2006:09:05 15:07:40 |
| Exposure Bias | -2 EV |
| Flash | No Flash |
| Focal Length | 31 mm |
| Quality | Fine |
| Metering Mode | Evaluative |
| Lens Type | Unknown (-1) |
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