/W – If you use this switch, FC will compress white space (tabs and spaces) during its comparison of your files./T – This switch will tell FC not to expand tabs to spaces.This is useful if you want to prevent two files from becoming extremely out of sync. / nnnn – Replacing the “n’s” here will tell FC that when it finds mismatched lines, it can only continue if it finds “n” consecutive matching lines after the mismatch.The default, if you do not specify a number is 100 lines of mismatched text. /LB n – Replace the “n” with a number to limit the amount of consecutive different lines that FC will read before it will abort./N – This switch can only be used with ASCII but it will show all the corresponding line numbers./L – This will compare your files as ASCII text./U – Use this switch to compare files as Unicode text files./A – This switch will make FC show only the first and last lines for each group of differences./C – If you need to do a case insensitive comparison, use this switch./B – This switch will perform a binary comparison.Percentage difference between 2 images. Output: Difference (percentage): 1.62559 E īy dividing only at the end, we work with integers only as the sum and avoid floating-point error from adding small numbers (per-pixel difference) to large ones (sum of differences). WriteLine ( "Images are of different sizes" ) ĭouble totaldiff = 0.0 //holds the number of different pixels Printf ( "%lf \n", 100.0 * totalDiff / ( double ) (im1 ->width * im1 ->height * 3 ) ) īitmap img1 = new Bitmap ( "Lenna50.jpg" ) īitmap img2 = new Bitmap ( "Lenna100.jpg" ) Ĭonsole. TotalDiff += fabs ( GET_PIXEL (im1, x, y ) - GET_PIXEL (im2, x, y ) ) / 255.0 If ( argc width != im2 ->width ) || (im1 ->height != im2 ->height ) )įprintf (stderr, "width/height of the images must match! \n" ) #define GET_PIXEL(IMG, X, Y) ((IMG)->buf) I would have preferred to calculate the RMS difference but it would be inconsistent with other results.ĭiff% += ABS((rgb1% AND &FF) - (rgb2% AND &FF))ĭiff% += ABS((rgb1% > 8 AND &FF) - (rgb2% > 8 AND &FF))ĭiff% += ABS((rgb1% > 16) - (rgb2% > 16)) ahk Thanks to tic (Tariq Porter) for his GDI+ Library OBM := DllCall ( "SelectObject", "Uint", mDCo, "Uint", hBMo ) MDCi := DllCall ( "CreateCompatibleDC", "Uint", 0 )ĭibSection := CreateDIBSection2 (mDCo, width, height ) MDCo := DllCall ( "CreateCompatibleDC", "Uint", 0 ) Height := Gdip_GetImageHeight (pBitmapFile1 ) Width := Gdip_GetImageWidth (pBitmapFile1 ) Hbmi := Gdip_CreateHBITMAPFromBitmap (pBitmapFile1 ) PBitmapFile1 := Gdip_CreateBitmapFromFile (imageFile ) Global disposables hBitmap will be disposed later _maxindex ( )ĭllCall ( "DeleteObject", "Uint", disposables. Please ensure you have gdiplus on your system MsgBox, 48, gdiplus error!, Gdiplus failed to start. NumPut (bpp, NumPut ( 1, bi, 12, "UShort" ), 0, "Ushort" ) NumPut ( VarSetCapacity (bi, 40, 0 ), bi ) Y := numget (pixels2 - 1, A_Index, "uchar" ) X := numget (pixels - 1, A_Index, "uchar" ) Put_Line ( "Diff" & Float'Image (Diff (Get_PPM (F1 ), Get_PPM (F2 ) ) ) ) ĭibSection := getPixels ( "lenna100.jpg" )ĭibSection2 := getPixels ( "lenna50.jpg" ) ("File-Lenna100.jpg") Return Float (Sum ) / ( 3.0 * Float (Left'Length ( 1 ) * Left'Length ( 2 ) ) ) Īda. Sum := Sum + (Left (I, J ) - Right (I + Offs_I, J + Offs_J ) ) If Left'Length ( 1 ) /= Right'Length ( 1 ) or else Left'Length ( 2 ) /= Right'Length ( 2 ) then Offs_J : constant Integer := Right'First ( 2 ) - Left'First ( 2 ) Offs_I : constant Integer := Right'First ( 1 ) - Left'First ( 1 ) Constraint_Error is propagated when images have different size.įunction Diff (Left, Right : Image ) return Float is Function "-" (Left, Right : Luminance ) return Count isġ-norm distance in the color space multiplied to 3:įunction "-" (Left, Right : Pixel ) return Count is
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