src/main/java/org/apache/commons/imaging/formats/tiff/itu_t4/T4AndT6Compression.java [228:255]:
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                int codingA0Color = WHITE;
                int referenceA0Color = WHITE;
                int a1 = nextChangingElement(codingLine, codingA0Color, 0);
                int b1 = nextChangingElement(referenceLine, referenceA0Color, 0);
                int b2 = nextChangingElement(referenceLine, 1 - referenceA0Color, b1 + 1);
                for (int a0 = 0; a0 < width;) {
                    if (b2 < a1) {
                        T4_T6_Tables.P.writeBits(outputStream);
                        a0 = b2;
                    } else {
                        a0 = compressT(a0, a1, b1, outputStream, codingA0Color, codingLine);
                        if (a0 == a1) {
                            codingA0Color = 1 - codingA0Color;
                        }
                    }
                    referenceA0Color = changingElementAt(referenceLine, a0);
                    a1 = nextChangingElement(codingLine, codingA0Color, a0 + 1);
                    if (codingA0Color == referenceA0Color) {
                        b1 = nextChangingElement(referenceLine, referenceA0Color, a0 + 1);
                    } else {
                        b1 = nextChangingElement(referenceLine, referenceA0Color, a0 + 1);
                        b1 = nextChangingElement(referenceLine, 1 - referenceA0Color, b1 + 1);
                    }
                    b2 = nextChangingElement(referenceLine, 1 - codingA0Color, b1 + 1);
                }
                final int[] swap = referenceLine;
                referenceLine = codingLine;
                codingLine = swap;
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src/main/java/org/apache/commons/imaging/formats/tiff/itu_t4/T4AndT6Compression.java [297:324]:
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                int codingA0Color = WHITE;
                int referenceA0Color = WHITE;
                int a1 = nextChangingElement(codingLine, codingA0Color, 0);
                int b1 = nextChangingElement(referenceLine, referenceA0Color, 0);
                int b2 = nextChangingElement(referenceLine, 1 - referenceA0Color, b1 + 1);
                for (int a0 = 0; a0 < width;) {
                    if (b2 < a1) {
                        T4_T6_Tables.P.writeBits(outputStream);
                        a0 = b2;
                    } else {
                        a0 = compressT(a0, a1, b1, outputStream, codingA0Color, codingLine);
                        if (a0 == a1) {
                            codingA0Color = 1 - codingA0Color;
                        }
                    }
                    referenceA0Color = changingElementAt(referenceLine, a0);
                    a1 = nextChangingElement(codingLine, codingA0Color, a0 + 1);
                    if (codingA0Color == referenceA0Color) {
                        b1 = nextChangingElement(referenceLine, referenceA0Color, a0 + 1);
                    } else {
                        b1 = nextChangingElement(referenceLine, referenceA0Color, a0 + 1);
                        b1 = nextChangingElement(referenceLine, 1 - referenceA0Color, b1 + 1);
                    }
                    b2 = nextChangingElement(referenceLine, 1 - codingA0Color, b1 + 1);
                }
                final int[] swap = referenceLine;
                referenceLine = codingLine;
                codingLine = swap;
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