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I have been using Filter > Distort > Equations to modify text onto a sine curve. First I rasterize the text, then apply Filter > Distort > Equations with the following formulae: x=x y= y+(h*a/2)*(b*sin(360*x/w/c)+(1-b)*cos(360*x/w/c)) This filter works as intended as a one-off, and whilst recording the macro, but If I then export the macro, and try to apply the macro later nothing happens. The history panel shows that it has been applied, but the image is unchanged. This happens whether I load the macro as a single macro, or if I add it to a library and load it from there. Text onto sine-cosine curve.afmacro Anyone any ideas? John

The equations facility in Affinity is not well documented. There is limited support in some AP actions, but the Transform and Distort > Equations filter offers a wide range of functions. This tutorial focuses on using the trigonometrical functions, sine, tangent and arctangent. The argument to many trigonometrical functions is an angle. In mathematics this is usually expressed in radians. However, the Affinity functions expect their argument in degrees. Sines and cosines The argument expected is in degrees, and over 360 degrees, the value of the function varies between -1 and +1. The sine function starts at zero and rises to a maximum at 90 deg, then falls to zero at 180 deg, falling to a minimum of -1 at 270 deg before rising to zero at 360 deg. If we wish to map this cycle to the width of an image, then we can use sin(360*x/w). Typically we would want the amplitude of the cycle (the maximum and minimum) to be more than 1 and -1, so we add a scale factor, measured in pixels. For an amplitude of 100 pixels, we have 100*sin(360*x/w). This gives one cycle across the width of the image. If we want more than one cycle, we can add a multiplier in the argument, so for three cycles per width, we can use 100*sin(3*360*x/w). Note that I use 3*360 rather than 1080 since it preserves the standard 360 multiplier. As an example, here is a checkerboard with Filter > Distort > Equations: x=x y=y+100*sin(2*360*x/w) If we apply this to a real image, we get: This is varying the vertical position of a point along the x-axis. We could vary the vertical position of a point along the y-axis by using the equation: y=y+100*sin(2*360*y/h) For the checkerboard, this would give: And for the Severn Bridge we get: We could even combine them both with the formula: y=y+100*sin(2*360*x/w)*sin(2*360*y/h) to give: or, for a real image: I will be adding further examples using tangents and cotangents.

I have been trying to devise a macro using the Distort > Equations, but it is hampered by a lack of documentation. I recall having once seen a list of supported functions, but I cannot now locate it. Neither Affinity help, this forum nor even Google have revealed this. I assume the same engine will apply to Transform using Equations. Can anyone please tell me where it could be found?

Blending-related wish list: Adding "Use beneath layers as initial Destination" button in Apply Image filter.Such button would allow for typical use case when you want to perform custom blending. Nowadays you have to: temporarily hide the layer "S" you want to blend, Merge Visible, unhide the layer "S" and move it below new merged layer "D", switch to layer "D", Apply Image and drag layer "S" onto its dialog window to use it as Source. Supporting presets for equations in Apply Image.It's obvious enhancement for better automation. Defining custom blend mode via Adjustment Layer (possibly called Blend Adjustment).It would work for such layer only when it is a child layer. Presets here are also crucial. Defining custom global (accessible in all documents) or local (accessible in current document) blend modes.The most robust solution for users performing repeatedly their own custom blending. In Blend Mode Manager there should be a way to see (in a read-only manner) already existing blend modes with equations (for blend modes expressable in plain equations). Blend mode definition should be performed using equations where:S (Source) = current layer [aka Active or A] D (Destination) = beneath layers [aka Background or B] In case of Blend Adjustment source would be the parent layer. Example of custom blend mode: Remove DR=(DR-SR*SA)/(1-SA) DG=(DG-SG*SA)/(1-SA) DB=(DB-SB*SA)/(1-SA) DA=DA(It doesn't make sense for truly opaque layer, of course.)

Does someone know how to implement Floyd-Steinberg or Jarvis, Judice, Ninke dithering with equations? Is that even possible at this point?

Hi all This is a bit embarrasssing but, curious to explore features, I went to try the Equatons filter and I can't get it to work!! I am applying it to a plain simple jpg - nothing! I am using Photo 1.5.0.45. HELP!! :) Adam