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Found 4 results

1. ## Using Equations in Distort - Convert to Polar

Conversion of a rectangular image to polar co-ordinates using Equations is not straightforward. A major problem is that the origin of the rectangular Cartesian co-ordinates is the top left, whereas for a polar display, you would typically want the origin on the midline, probably near the bottom. The following equations assume that the origin is in the midline along the x-axis, and at or near the bottom on the y-axis. First select Filter > Distort > Equations and enter: x=w*atan((x-w/2)/(h/a-y))/100+w/2 y=h-sqrt((x-w/2)^2+(h-y)^2) The expression (x-w/2) displaces the horizontal origin to the centre, and the expression (h-y) displaces the vertical origin to the bottom. In the first formula, for x, there is a parameter a, which allows you to scale the polar transformation; reducing the parameter a stretches the image around the circle. The 100 is an arbitrary scaling parameter which seems to work. The expression +w/2 at the end re-centres the image. This seems to be necessary, but I am not sure why. I would have expected to deduct w/2 rather than add it! Here is an original image of the Quantum Leap statue in Shrewsbury: With this transform using the default parameter a, this produces a quadrant. And with the parameter set to approximately 0.6: Here is the Macro: PolarQuadrant.afmacro The first thing the macro does is to unlock the image. I tend to do this automatically in macros. It is probably unnecessary. I ought to be able to give the adjustable parameter a, a name, but I have not been able to do this. John
2. ## Rectangular to Polar / Polar to Rectangular

Hello, First of all I have to say thank you for doing an alternative to photoshop (and illustrator) it is more than welcome! I am doing some 14k hdri panorama editing at the moment and found some things which unfortunately work not as well as in photoshop yet. Maybe there is a way to fix them!? The process: To get rid of the tripod in the picture it is necessary to do some clone stamping. So what you do is flipping the image vertically and then use the rectangular to polar filter to unstretch the floor. after clone stamping you use the polar to rectangular filter and flip the image vertically another time. The Problems: - after using the polar to rectangular filter the top of the image does a weird stretching (photoshop doesn't do that) what I do to avoid this is just making a mask and only paint in the edited (clone stamped) parts. Unfortunately the second problem is bigger: - after using the polar to rectangular filter the image is unsharp and has a weird jpeg like artifact pattern. First Problem (Stretching in the top of the image) Second Problem (Unsharp Artifacts) It looks similar to the artifacts in the following post: https://forum.affinity.serif.com/index.php?/topic/16741-rectangular-to-polar-good-results/ Thanks!
3. ## Rectangular to polar - good results

How do one get a good results with Rectangular to polar - No matter what I do I keep getting very poor antialiasing.
4. ## Grid Suggestions

It would be awesome if we could: - Make polar, circular grids. - Create grids that can be imported and resized for reuse in projects such as a golden rectangle grid. - Allow grids and guides to be set in their own layers so that multiple grids and guides can be stacked on top of one another so that modular grids can be created. - Change the color of grids and guide lines. - Set where grid gutters should fall, left, right, or both sides of columns, above, below or both sides of rows. - Create grids out of shapes, rectangle shape can be created and turned into a grid (with the same functionality as global grids) allowing us to be truly creative with the grids we create. - Typographic grids would be awesome as well, baseline for setting type on.
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