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How to convert results from DominantColors function over multiple images?

Hi there, I'm trying to map the function DominantColors to several images in the same folder. I think I got that part sorted out.

(*Set the folder path*)
folderPath = 
  "/myfolder";

(*Get a list of file names for all the images in the folder*)
fileNames = FileNames["*.png"];

(*Iterate over the list of file names*)
For[i = 1, i <= Length[fileNames], 
 i++,(*Import the image and find the dominant color*)
 img = Import[fileNames[[i]]];
 dominantColor = DominantColors[img, 5, "NearestHTMLColor"];
 (*Print the file name and the dominant color*)
 results = Print[fileNames[[i]] <> ": " <> ToString[dominantColor]]]




Dendrobium macropodum .png: {Black, Khaki, DarkKhaki, LemonChiffon, Sienna}

Dendrobium pachyphyllum  .png: {Black, Gainsboro, Thistle, DimGray, DarkKhaki}

Dendrobium sociale .png: {Black, DarkGray, Sienna, DarkMagenta, Plum}

How do I turn the results into csv form, with headings of the file name and each of the dominant colors in separate column?
POSTED BY: Nik Fadzly N Rosely
3 Replies
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Hi Nik,

There are much better alternatives to For and Print. E.g.

colors = {FileNameTake@#, 
Splice@DominantColors[Import@#, 5, "NearestHTMLColor"]} & /@ fileNames

padded = PadRight[#, 6, ""] & /@ colors
columnNames = ("Color " <> ToString@#) & /@ Range@5 // Prepend["File"]

results = padded // Prepend@columnNames
Export["dominant colors.csv", results]
POSTED BY: Rohit Namjoshi

Hi Rohit,

Thank you very much for this, so the final code looks something like this

SetDirectory[NotebookDirectory[]];
fileNames = FileNames["*.png"]
colors = {FileNameTake@#, 
    Splice@DominantColors[Import@#, 5, "NearestHTMLColor"]} & /@ 
  fileNames
padded = PadRight[#, 6, ""] & /@ colors
columnNames = ("Color " <> ToString@#) & /@ Range@5 // Prepend["File"]

results = padded // Prepend@columnNames
Export["dominant colors11.csv", results]

and the output looks like this (as attached). Again, you really saved me from copying and pasting hundreds of data to excel. Thanks man!

Attachment

Attachments:
Screenshot 2022-...png
POSTED BY: Nik Fadzly N Rosely

Hi Nik,

You are welcome. It might look cleaner if "File" was changed to "Species" and the ".png" was removed. To do the latter, replace FileNameTake with FileBaseName.
POSTED BY: Rohit Namjoshi
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