This jpg file (from photo dated 25 October 2022) posted to the Wikipedia page on the Dendera Zodiac represents a significant improvement to previous images available on-line, much sharper, though dimly lit, 72 dpi 60224 unique colors (cf. dend-zod-1.png, 3.27 MB, 1179 x 1182 pixels, 96 dpi 286533 unique colors):
Wikimedia Commons - Dendera Zodiac, 3,009 x 2,896 pixels, 4.78 MB:
Using freeware Gimp
Using freeware Inkscape
add another layer[Shift+Ctrl+N]; in View > "Show/Hide" > check/enable the "Tool Controls Bar" and "Snap Controls Bar"; click the Arrow next to "Toggle snapping on/off"[Shift+%] to open "popover" menu in "Advanced mode", check/enable "Guide lines"; click "Create circles, ellipses and arcs"[E]; while holding down [Ctrl] key, draw a circle starting at the "Handle to guide intersection" at the center of the grid until the "Handle to Path" or "Handle to guide" 'x' appears at the intersection of the nineteenth (19th, both vertical and horizontal) lines from the grid center, maintaining thin (0.01 mm) stroke width; zoom to selection [3], deselect [Esc], then draw a another circle starting at the center until the 'x' appears at the first (1st) grid lines from grid center; select all [Ctrl+A], in Path click "Object to Path" [Shift+Ctrl+C], in Extensions > Generate from path, "Interpolate" Exponent 1.0, Interpolation steps 17, "Live preview" and in a few moments, nineteen (19) concentric circles appear grouped together, click Apply, close "Interpolate" window, in Edit click "Delete"[Delete] to remove the first two (extra) inner and outer circles; lock layer, save, and close file [Ctrl+W] to clear "undo history"; reopen this file, zoom to page and add a fourth layer;
click "Draw Bezier curves and straight lines" [B] icon on the toolbox and draw a horizontal line from the center of grid to the outer edge on the right side, in Edit click "Duplicate"[Ctrl+D], select all [Ctrl+A], in Object click "Align and Distribute" [Shift+Ctrl+A], and Relative to "First selected", click "Align right edges of objects to left edge of the anchor" to move copied line segment to left side of grid center, in Object "Group" [Ctrl+G]; holding control[Ctrl] key, select left line segment, in Object "Transform" [Shift+Ctrl+M], in "Move" set Horizontal -1.000 mm, click Apply, select all, click "Align and Distribute" [Shift+Ctrl+A], unlock grid layer, hold [Shift+Ctrl] and select grid, Relative to "Last selected", click "Center on vertical axis", deselect all; select line segment(group of 2), "Duplicate"[Ctrl+D], in Object "Rotate 90* CW", select all [Ctrl+A], Group [Ctrl+G], Duplicate [Ctrl+D], Transform [Shift+Ctrl+M], Rotate Angle +10.000*; again select all, group, duplicate, transform, rotate +20.000*; select all, group, duplicate, transform, rotate +40.000*; finally, select all, group, rotate +10.000*(note gaps for horizontal and vertical grid centerlines); holding [Shift+Ctrl] to preserve aspect ratio, expand this radial grid so that all lines extend just outside corners of image, set stroke width 0.01 mm; lock all layers, save, close, backup; reopen file, zoom to page, add a fifth layer;
hide layers 1 , 2, and 4; unlock layer 3 (circles), select all, copy, deselect, lock layer 3; in layer 5 click "Paste in Place"[Ctrl+Alt+V], ungroup, deselect, and with guides enabled, select the smallest circle at center, hold the [Shift] key and stretch the horizontal centerline selection handles one(1) guide square outward, tangent to the next larger circle as indicated by the snap-enabled 'x' and "cusp node to guide", resulting in a 2:1 integer-ratio ellipse; repeat this step for each larger circle, 3:2, 4:3, 5:4, 6:5, 7:6, ... and so on until 19:18; select all, set stroke width 0.01 mm; the largest circle (19) already exists in layer 3, so delete it from layer 5; select all, copy, then add a sublayer under current ellipse layer, paste in place, rotate 90* CW; lock and hide all layers; save, close, reopen, zoom to page; show layers 1 (image) and 3 (circles); add a sixth layer; starting at center draw a circle just large enough to circumscribe entire image; set color fill to blue (hexadecimal RGBA #0000ffff), stroke width zero(0), zoom to selection; in circle/arc toolbar set "Start" 355.000 and "End"
5.000, for a 10 degree circle sector centered on 0 polar degrees; in Path click "Path Effects" [Ctrl+&], click "+" icon to "Add path effect", which opens "Live Path Effects Selector"; click "Rotate copies", Number of copies 36, check Split elements; press [Tab] key once to select next 10 degree sector counterclockwise and set fill color to magenta (#ff00ffff); press tab, set fill to orange-yellow (#ffbe00ff); tab, set fill to blue-violet (#4000ffff); tab, set red (#ff0000ff); tab, yellow (#ffff00ff); tab, violet (#8000ffff); repeat tab or click to select each next sector CCW, red-orange (#ff4001ff), green (#00ff00ff), violet-magenta (#bf00feff), orange (#ff8000ff), cyan (#00ffffff), magenta (#ff00ffff), orange- yellow, blue, red, yellow, blue-violet, red-orange, green, violet, orange, cyan, violet-magenta, orange-yellow, blue, magenta, yellow, blue-violet, red, green, violet, red-orange, cyan, violet-magenta, and finally, orange; save file, close, backup, reopen, zoom to drawing, select first "Rotate copies" 10 degree segment and change Starting angle from 0.00 to 5.00, rotating the entire group of solid color segments five (5) degrees counterclockwise; select all, set fill "Opacity" to (about) 7%, deselect, lock and show all layers, uncheck/disable guides, hide dialogs, full screen, zoom page width; hold Shift and right mouse button to pan, click + to zoom in, - to zoom out; save file, show dialogs, add a seventh layer;hide all layers; show and unlock layer 5 (ellipses) and its sublayer, select all in all layers [Ctrl+Alt+A], copy, lock and hide layer 5; select and show layer 7, paste in place [Ctrl+Alt+V], hide dialogs, zoom page width; select smallest (2:1) ellipse, hold [Shift] and select second smallest (2:3) ellipse (which is tangent to the first ellipse at its major axis), in Path click "Exclusion" [Ctrl+^], set fill color to violet; select third-smallest (4:3) ellipse, hold Shift and select fourth-smallest (4:5) ellipse, click Exclusion [Ctrl+^], set fill color to green; select fifth-smallest (6:5) ellipse, hold Shift and select sixth-smallest ellipse (6:7), click Exclusion, set fill color to cyan; select seventh-smallest ellipse (8:7), hold Shift and select eighth-smallest ellipse (8:9), click Exclusion, set fill color to orange-yellow; select ninth-smallest (10:9) ellipse, hold Shift and select tenth-smallest (10:11) ellipse, click Exclusion and set fill color to blue; select eleventh-smallest (12:11) ellipse, hold Shift and select twelfth-smallest (12:13) ellipse, click Exclusion, set fill color to blue-violet; select thirteenth- smallest (14:13) ellipse, hold Shift and select fourteenth-smallest (14:15) ellipse, click Exclusion, set fill color to violet; select fifteenth-smallest (16:15) ellipse, hold Shift and select sixteenth-smallest (16:17) ellipse, click Exclusion, set fill color to violet; finally, select seventeenth-smallest (18:17) ellipse, hold Shift and select eighteenth-smallest (18:19, largest) ellipse, click Exclusion, set fill color to magenta; save file, close, backup, reopen; show guides, show dialogs, zoom to page, click "Create rectangles and squares" [R] and draw a rectangle starting on the horizontal centerline at least one guide square to the left of largest ellipse up to the right side enough to cover the entire top half of these elliptical lines; select all, in Object > Clip > Set Clip; this non-destructive option makes only the top half of ellipses visible; select all, group [Ctrl+G], duplicate [Ctrl+D], flip vertical [V], select all, in Object, click "Align and Distribute" [Shift+Ctrl+A], click "Align top edges of objects to bottom edge of anchor", hide guides, zoom to drawing; hold [Ctrl] key to click on violet color fill in bottom half of smallest ellipse and change color from violet to orange; repeat this step for each larger bottom ellipse, green to orange, cyan to red-orange, orange-yellow to yellow, blue to red, blue-violet to magenta, and violet to violet-magenta; leave the two largest ellipses, violet and magenta, unchanged; select all, in Object > Clip > Release Clip, then Ungroup [Shift+Ctrl+G], in "Fill and Stroke", set stroke width to zero (0.000), copy (all), lock and hide layer 7; add eighth layer and paste in place [Ctrl+Alt+V], group [Ctrl+G] and rotate 90* CW; ungroup, set stroke width 0.01, deselect; starting at the left side and working to the right, leave first two largest ellipses, magenta and violet, unchanged; change third ellipse fill color from violet-magenta to blue; change fourth ellipse fill color from magenta to green; change fifth ellipse fill color from red to yellow; change sixth ellipse fill color from yellow to orange; change seventh ellipse fill color from red-orange to red; change eighth ellipse fill color from orange to magenta; leave smallest, ninth and tenth ellipse fills, orange and violet, as is; continuing to the right, change green to magenta, cyan to red, orange-yellow to orange, blue to yellow, blue-violet to green, and violet to blue; select all, set stroke width to zero (0.000), set fill and stroke "Blend mode" to "Overlay", and "Opacity" to (about) 9%, deselect and lock layer; show and unlock layer 7, select all, set blend mode to overlay and opacity 9%, deselect and lock layer; show layers 1 (image), 3 (circles), 5 (ellipses), and 6 (color sectors); save, close, backup, reopen; zoom to page, in File click "Export" [Shift+Ctrl+E], in Page tab try "DPI" 2400, click Export, use zero (0) compression for image size of (about) 7628 x 7452 pixels, 1013104 unique colors, 217 MB; save and close file; reopen this file, in Layers and Objects (Shift+Ctrl+L) right-click Layer 1 (image) and select "Hide/show other layers" to hide (all) other layers, export page using same 2400 dpi and 0 compression settings, but with a different (*.png) file name; close without saving and exit Inkscape; next, open this raster image file in Gimp, in View > Zoom > click "Fit Image in Window" [Shift+Ctrl+J]; in Image > Transform >
click "Rotate 90* clockwise"; in File click "Export as" [Shift Ctrl+E], then click "Create Folder", type folder name (e.g. "90cw"), and name the file (e.g. "90cw1"); set "Compression level" to zero (0) and click "Export"; next, in Edit click "Undo Rotate image" [Ctrl+Z], in Image > Transform > click "Rotate 90* counter-clockwise", in File click "Export as", click "Create Folder" and name it ("90ccw"), name file "90ccw1", compression level 0, export; next, in Edit click "Undo Rotate image", in Image > Transform > "Rotate 180*", then "Export as", "Create Folder" ("180"), name file "180-1", compression 0, export, close file; finally, repeat these same steps for the first png file with added overlay (circles, ellipses, color fills), to the same file folders, using sequential file names "90cw2", "90ccw2", "180-2"; close file, exit Gimp, backup these (8) png files; save, share, view, print, etc.
Using freeware Irfanview