5/5/2023 0 Comments Graphicconverter opacity layerTo extract the alpha (note: php has a GD limitation of 128 level alpha, rather than 256), so some precision is lost. As for recovering the original mask, I haven't looked at that yet.īoth code samples are proof-of concept and SLOW. So a potential work-around for this is to find a software package that does not support alpha PNG and resave it from there. If I apply the layer mask (permanently) and then create the png, then php serves up the original image if alpha is disabled. Gradients which contain some amount of 100% clear do not show up with alpha disabled. If I create a png with random transparency and save while the layer has a mask, then the 100% clear areas (such as from a box tool) show as white whether alpha support is enabbled or not. I made some sample png files and then used php to manipulate them (source code below). Once you apply the mask, the layer is rendered and the unseen image data is thrown away. I reckon that without advanced pixel-based scripting, this is not possible within Photoshop.īased upon the answers given and your comments, the short answer is: you can't do what you want. Is anyone smarter than me and can create this? In the last step, I 'unflattened' the layer by double-clicking, and created a layer mask using the alpha-layer from the original image, resulting in this:Īs stated above, this doesn't create an un-premultiplied image, as my example would have to look like this to be un-premultiplied: I then pasted the R-G-B layers I had created into the corresponding channels in the new image: Then i created a new image with the same dimensions and without transparency. I also extracted the transparency of the original image into a layer by command-clicking on the layer-thumbnail and filling a new layer with the selection. The channel view in PS looks like this:īy selecting the individual channels I copied them into individual layers, then flattened them with a white background to recieve a black and white map as shown here: Extract true R-G-B-A channels from image.I leave this answer up for others to build upon it. I fooled myself, and you as well in the process: What I created is indeed a premultiplied image - not premultiplied with black but with white. I want to know how to go from State B to State A. so - to go from state A to State B, one simply has to apply the layer mask. IMPORTANT: the layer is just for this example fully constant red - but you could think of any arbitrary image instead of the constant red. create a mask with a white-to-black gradient.create a new layer and paste in any image.I hope you understand the problem and can give me a solution to it. I can't just underlie the transparent layer with black, take the selection from it as a mask and merge the layers, because this would result in the alpha being premultiplied in the RGB values. the result should look the same as the original. Now I want to transform this to an opaque layer (just unpremultiplied RGB) + a alpha mask. In addition, because gradients are generated by the browser, they look better than raster images when zoomed in, and can be resized on the fly.I have a transparent layer in Photoshop CS5 (so internally, it's most probably stored as unpremultiplied RGB component plus an alpha component per pixel). Because gradients are dynamically generated, they can negate the need for the raster image files that traditionally were used to achieve similar effects. Gradients can be used anywhere you would use an, such as in backgrounds. In addition to overall opacity, which affects layer styles and blending modes applied to a layer, you can specify fill opacity. A layer with 1 opacity appears nearly transparent, whereas one with 100 opacity appears completely opaque. You can also create repeating gradients with the repeating-linear-gradient(), repeating-radial-gradient(), and repeating-conic-gradient() functions. A layer’s overall opacity determines to what degree it obscures or reveals the layer beneath it. You can choose between three types of gradients: linear (created with the linear-gradient() function), radial (created with the radial-gradient() function), and conic (created with the conic-gradient() function). Huge inset shadow which does about the same thing as a gradient overlayĬSS gradients are represented by the data type, a special type of made of a progressive transition between two or more colors. Multiple background with a translucent single gradient over image from an an old codepen of mine with few examples. mind the third one if you already read other answers about bg and box-shadow): So here is about my answer out there, answer that gives you 3 easy ways without extra markup nor pseudos :Īt first, i saw two easy options at that time (2016, those two option are also within answers standing here too, so nothing really new to add about these. That duplicate, right here and after a few years, is still missing the background-blend-mode property, widely implemented nowdays (It lays below the multiple background and inset shadow examples). From an answer of mine at How to add a color overlay to a background image? marked as a duplicate of that question where no pseudo element ,nor extra element is required.
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