In Photoshop (file--> New)
Open ---> New document
Then give value for width ,height,resolution,color mode ,background
Eg : W :100 , h:25 ,R: 72 pix/inch,Color mode : RGB , B= Transparent
Then click Ok ,then new canvas will be loaded
Then Open Layers pallet
( windows ---> layers) .There u can notice 'Layer 1' named black layer ; rename it 'bg' . Then from tools pallet select rounded rectangle tool (shift + U) .Then using the tool size it according to ur wish .Now Layer 'bg' will be a vector shaped layer .Then right click
the mouse button from 'bg' layer ;Select 'Rasterize layer' . Now we can edit this layer .Add one more layer name it as text .Type some texts ('Prabin') on the layer 'text' .Then press ctrl and press mouse above the icon
'T' on layer 'text' .Now there will be a selection around layer 'text' . Then make the layer 'text' invisible ;by clicking the icon 'eye ' at left side of the layer .Then select layer 'bg' and press del button .Then set opacity of 'bg' layer to 30%. Save the file in PNG format ( PNG -24) ,Press Alt+ Ctrl+shift+S ,then select check box Save for Web & Devics . Then Select File format as 'PNG-24' ; check transparency check box.Then Save
Now Onwards this can be used in any picture for digital watermarking .
For this open this PNG filw Press Ctrl+A to Select the whole picture and Copy (Ctrl+C) it and paste (Ctrl+V) it over the picture where this watermarking is to publish .Now Press (Ctrl+l) to inverse the color of watermarking if wanted