10/4/2023 0 Comments Opacity rectangle png![]() Gfx.DrawImage(image, new Rectangle(0, 0, bmp.Width, bmp.Height), 0, 0, image.Width, image.Height, GraphicsUnit.Pixel, attributes) īitmapImage.CacheOption = BitmapCacheOption. ImageAttributes attributes = new ImageAttributes() Īttributes.SetColorMatrix(matrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap) Using (Graphics gfx = Graphics.FromImage(bmp)) create a graphics object from the image The idea is explained in the following picture taken from the link above (think of the solid white rectangle as semitransparent, excuse my poor editing skills). create a Bitmap the size of the image providedīitmap bmp = new Bitmap(image.Width, image.Height) I need to add text to the image but I need it placed on top of a white semitransparent rectangle so that it can be seen. Public Image SetImageOpacity(Image image, float opacity) Gfx.DrawImage(image, pwidth / 2 - image.PixelWidth / 2, pheight / 2 image.PixelHeight / 2) /rebates/2ffree-png2frectangle&. If your input image already has transparency, then you would have to extract its alpha channel and combine it with the rectangle image. For ImageMagick 7, replace convert with magick. Create Color Styles from Images, solid colors and gradients. For Windows, remove the from the parentheses and change the end of line to. Add new Fill layers by clicking the + icon. Convert the image to which you want to apply the transparency to RGBA and use the image object putalpha() method to copy the alpha channel you created into the images alpha channel. Remove the image from the object by clicking the - icon. Fill the alpha channel with white (full opacity) and draw the rectangle on the alpha channel image in black (full transparency). Toggle visibility of that Image by clicking the eye icon. We represent this as a percentage value (). XImage image = XImage.FromBitmapSource(Convert(myTransparenImage)) Adjust the Opacity of the Image using the field provided. Image myTransparenImage = SetImageOpacity(Image.FromFile("MyPath"), (float)opacityYouwant) // opacityYouWant has to be a value between 0.0 and 1.0 XGraphics gfx = XGraphics.FromPdfPage(page, XGraphicsPdfPageOptions.Append) This has already been answered so I am just sharing my code of doing so. What you can do is change the image you feed to PDF sharp. you can select a rectangular area of the PNG and apply the opacity effect only in this region. PDFSharp can not change the image opacity. Worlds simplest online utility that changes PNG opacity. The code below lets you change the opacity. Pct = 50 # temparily set pct to 50 percent for demonstrationĪlpha_new = (alpha * alpha_circ.astype(np.float64) / 255).clip(0,255).astype(np.uint8)Ĭv2.imwrite('lena_circ_fade.I was looking in to this aswell now for making a watermark (companyLogo) to place over pdf sheets. Setting the alpha part to the opacity level you want will give you image opacity. Color: rgb: (1, 1, 1,a) Check this link in docs. # extract the BGR component and the alpha component In your kivy file make these modifications. Img = cv2.imread("lena_circ.png", cv2.IMREAD_UNCHANGED) Finally put the new alpha into the original image replacing the old alpha. One needs to extract the image alpha, create a new alpha for the gradient and then multiply the two alpha channels together. Here is how to do that in Python/OpenCV if the image already has transparency. alpha off -compose copy_opacity -composite \ # (note: display does not show transparency) Result = cv2.cvtColor(result, cv2.COLOR_BGR2BGRA) Pct = 25 # temparily set pct to 25 percent for demonstration Replace the alpha in the BGRA image with the stacked alpha Create a vertical gradient going from 255 to 0 for the bottom Compute top and bottom heights for the alpha channel Here is one way to do that in Python/OpenCV/Numpy for opaque images.
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