Hi,  Save the following in a .psjs file and File > Scripts > Browse... It should output a selection of the clusters you need. Caveat: it doesn't work on Bitmap, please convert the image to Grayscale first.   const photoshop = require("photoshop"); const { core, imaging, app } = photoshop; async function getDocumentPixelData(documentID) { const document = app.activeDocument; const width = document.width; const height = document.height; try { // Get the pixel data of the document const imageObj = await imaging.getPixels({ documentID: document.id, colorSpace: "Grayscale", }); return imageObj.imageData; } catch (error) { console.error("Error getting document pixel data:", error); throw error; } } async function findWhiteSegments(imageData, width, height, minLength) { try { const pixelData = await imageData.getData(); const whiteSegments = []; const components = imageData.components; // Scan columns for (let x = 0; x < width; x++) { let whiteLength = 0; let startY = -1; for (let y = 0; y < height; y++) { const index = (y * width + x) * components; const gray = pixelData[index]; if (gray === 255) { if (whiteLength === 0) startY = y; whiteLength++; } else { if (whiteLength >= minLength) { whiteSegments.push({ x, startY, length: whiteLength }); } whiteLength = 0; startY = -1; } } if (whiteLength >= minLength) { whiteSegments.push({ x, startY, length: whiteLength }); } } return whiteSegments; } catch (error) { console.error("Error finding white segments:", error); throw error; } } async function createSelectionFromSegments(segments, width, height) { try { const selectionData = new Uint8Array(width * height).fill(0); segments.forEach((segment) => { for (let i = 0; i < segment.length; i++) { selectionData[(segment.startY + i) * width + segment.x] = 255; } }); const selectionBuffer = { typedArray: selectionData, width, height, components: 1, colorSpace: "Grayscale", colorProfile: "Gray Gamma 2.2", }; return selectionBuffer; } catch (error) { console.error("Error creating selection from segments:", error); throw error; } } async function putSelectionFromBuffer(documentID, selectionBuffer) { try { console.log("Creating image data from buffer..."); const imageData = await imaging.createImageDataFromBuffer( selectionBuffer.typedArray, { width: selectionBuffer.width, height: selectionBuffer.height, components: selectionBuffer.components, colorSpace: selectionBuffer.colorSpace, // colorProfile: selectionBuffer.colorProfile, chunky: true, } ); console.log("Putting selection..."); try { await imaging.putSelection({ imageData, }); } catch (error) { console.error("Error putting selection:", error); throw error; } console.log("Selection added successfully."); } catch (error) { console.error("Error putting selection from buffer:", error); throw error; } } async function main() { try { await core.executeAsModal( async () => { const documentID = app.activeDocument.id; const imageData = await getDocumentPixelData(documentID); const width = imageData.width; const height = imageData.height; const minLength = 800; const whiteSegments = await findWhiteSegments( imageData, width, height, minLength ); const selectionBuffer = await createSelectionFromSegments( whiteSegments, width, height ); await putSelectionFromBuffer(documentID, selectionBuffer); }, { commandName: "Get Document Pixels" } ); } catch (error) { console.error("Error in main function:", error); } } main().catch(console.error);   It should give you a good starting point. Best,     ... View more

Stephen's answer is the correct one—I'd also like to point out that you can use Alchemist by Jaroslav Bereza. People use Alchemist a ton, but few know it's actually a suite of helper plugins: Alchemist, Sorcerer and Occultist (I know...  Eastern-European humour 😁) Occultist implements a custom ATN parser: It's rather handy and super-quick. Anyway, probably the Czech Republic has to be considered part of Central Europe—Wikipedia says both definitions are acceptable. I'll ask Jarda.   ... View more

Hi, I've just copied and pasted your code in a `.psjs` file, verbatim, with one minor correction:   await img.saveAs.jpg(file, { quality: 8 }); // 👈 note the await   I've one document open, I select File > Scripts > Browse...; point to the `.psjs` file; the save dialog pops up, I enter a filename; a progress bar briefly flashes; the file is correctly saved on disk.   Please note that:  saveAs methods are asynchronous: they return a promise, hence the need to `await`. Manifest permissions for disk access are needed only in the context of UXP plugins, not UXP scripts. File management is one confusing piece of UXP. Although it is a paid resource, I devote an entire chapter to it in my Professional Photoshop UXP book.   I'd kindly remind the moderators to reset the `DAYS_SINCE_QUESTIONS_ABOUT_SAVING_FILES` counter. 🙃     ... View more