boolean setThresholdLevels(ImagePlus imp, ImageProcessor ip) { double t1 = ip.getMinThreshold(); double t2 = ip.getMaxThreshold(); boolean invertedLut = imp.isInvertedLut(); boolean byteImage = ip instanceof ByteProcessor; if (ip instanceof ShortProcessor) imageType = SHORT; else if (ip instanceof FloatProcessor) imageType = FLOAT; else imageType = BYTE; if (t1 == ImageProcessor.NO_THRESHOLD) { ImageStatistics stats = imp.getStatistics(); if (imageType != BYTE || (stats.histogram[0] + stats.histogram[255] != stats.pixelCount)) { IJ.error( "Particle Analyzer", "A thresholded image or 8-bit binary image is\n" + "required. Threshold levels can be set using\n" + "the Image->Adjust->Threshold tool."); canceled = true; return false; } boolean threshold255 = invertedLut; if (Prefs.blackBackground) threshold255 = !threshold255; if (threshold255) { level1 = 255; level2 = 255; fillColor = 64; } else { level1 = 0; level2 = 0; fillColor = 192; } } else { level1 = t1; level2 = t2; if (imageType == BYTE) { if (level1 > 0) fillColor = 0; else if (level2 < 255) fillColor = 255; } else if (imageType == SHORT) { if (level1 > 0) fillColor = 0; else if (level2 < 65535) fillColor = 65535; } else if (imageType == FLOAT) fillColor = -Float.MAX_VALUE; else return false; } imageType2 = imageType; if (redirectIP != null) { if (redirectIP instanceof ShortProcessor) imageType2 = SHORT; else if (redirectIP instanceof FloatProcessor) imageType2 = FLOAT; else if (redirectIP instanceof ColorProcessor) imageType2 = RGB; else imageType2 = BYTE; } return true; }