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In this article Xiaobian for you to introduce in detail "Python how to achieve PS filter wave effects", the content is detailed, the steps are clear, the details are handled properly, I hope that this "Python how to achieve PS filter wave special effects" article can help you solve doubts, the following follow the editor's ideas slowly in-depth, together to learn new knowledge.

Using computer programming language to realize the wave effect of police officer filter

Importnumpyasnp

Fromskimageimportimg _ as _ float

Importmatplotlib.pyplotasplt

Fromskimageimportio

Importnumpy.matlib

Importmath

File _ name 2room'd: / VisualEffects/PSalgorithm/4. Jpg'

Img=io.imread (file_name2)

Img=img_as_float (img)

Row,col,channel=img.shape

Img_out=img*1.0

= 70.0

= 30.0

Degrees = 20.0

Center_x= (col-1) / 2.0

Center_y= (row-1) / 2.0

Xx=np.arange (col)

Yy=np.arange (line)

X_mask=numpy.matlib.repmat (xx,row,1)

Y_mask=numpy.matlib.repmat (yy,col,1)

Y_mask=np . Transpose (y_mask)

Xx_dif=x_mask-center_x

Yy_dif=center_y-y_mask

X = degrees * NP. Sin (2 * Mathematics. Pi * YY _ dif/alpha) xx _ dif

Y = degrees * NP. Cos (2 * Mathematics. Pi * xx _ dif/beta) YY _ dif

X_new=x center_x

Y_new=center_y-y

Int_x=np.floor (x_new)

Int_x=int_x.astype (int)

Int_y=np.floor (y_new)

Int_y=int_y.astype (int)

Foriiinrange (row):

Forjjirinrange (col):

New_xx=int_x [ii,jj]

New_yy=int_y [ii,jj]

Ifx_new [ii,jj] 0orx_new [ii,jj] col-1:

Go ahead

Ify_new [ii,jj] 0ory_new [ii,jj] row-1:

Go ahead

Img_out [ii,jj,] = IMG [new _ yy,new_xx,]

Figure (1)

Plt.title ('www.jb51.net')

Plt.imshow (img)

Plt.axis ('off')

Figure (2)

Plt.title ('www.jb51.net')

Plt.imshow (img_out)

Plt.axis ('off')

(appendix: PS filter-Wave wave)

%% wave

% wave effect

Chrominance control center

Clear all

Close all files

Add a path ('e:\ Photoshop algorithm\ image processing\ PSAlgorithm')

I=im read ('4. Jpg')

Image=double (I)

% Image=0.2989*I (: 1) 0.5870 yuan I (: 2) 0.1140yuan I (: 3)

[rows, columns, channels] = size (image)

R=floor (max (row,col) / 2)

Image _ New = Image

Degree = 30% control the degree of distortion

Center _ X = (col 1) / 2

Center _ Y = (first line) / 2

Fori=1:row

Forj=1:col

X0=j-Center _ X

Y0 = Center _ Ymuri

X = degree * sin (2 * pi * y0amp 128) x0

Y = degrees * cos (2 * pi * x0Uniq128) y0

Xerox col/2

Y=row/2-y

If (x1xcolylrow 1)

X1 = floor (x)

Y1 = floor (y)

P=x-x1

Q=y-y1

Image_new (iMaginj,) = 1murp) * (1Muiq) * Image (y1menx1,) p* (1merq) * Image (y1menx11,).

Q * (1murp) * Image (y1 1menx1,) p*q*Image (y11recoverx1,)

End

End

End

Figure, imshow (Image _ new/255); the running effect of this example Python:

Original drawing

Effect picture

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