You can work with gradient files in Photoshop and process a gradient .png file to a .grd file typically used in the program. This will require some knowledge about how the program works, especially with the gradient editor and colors.
Home > Search converters: png to grd
Conversion of png file format to grd file format beta
Search for png to grd converter or software able to handle these file types.
Found 2 different conversion types using the same filename extensions.
Conversion png to grd type 1:
Convert from Portable Network Graphic to Adobe Photoshop gradient preset.
Microsoft Windows software 
- convert png to grd on Windows
Adobe Photoshop
Adobe Photoshop is great photography editing software that offers numerous features, powerful tools and other breakthrough capabilities to offer their users maximum performance for image editing.
The latest version, Photoshop CC is available through the new Adobe Creative Cloud suite. The previous version was Photoshop CS6.
File extension | File type (from-> to) | Convert | Open | Save | Edit | Create | Import | Export | Extract |
|---|---|---|---|---|---|---|---|---|---|
Convert from png file | Portable Network Graphic | Yes, Adobe Photoshop supports png file conversion as a source file type. | Yes | Yes | png editor | Yes | Yes | Yes | No |
to grd file | Adobe Photoshop gradient preset | No | Yes | Yes | grd editor | Yes | No | No | No |
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned png to grd. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
Apple macOS / Mac OS X software 
- convert png to grd on OS X
Adobe Photoshop for Mac
Adobe Photoshop for Mac is popular image editing application. It is able to create and compose images, edit photos and supports variety of image formats to open, export and convert.
The latest version, Photoshop CC is available through the new Adobe Creative Cloud suite. The previous version was Photoshop CS6.
Conversion png to grd type 2:
Convert from Portable Network Graphic to Artweaver gradient.
Microsoft Windows software - convert png to grd on Windows
Artweaver
Artweaver is a Windows Freeware program to simulate natural brush tools. It is therefore suitable to leave your creativity free run. Artweaver offers you a clear program window, which can be used without training immediately.
You can create sketches from photos and experiment with a wide range of brushes. The brush simulation is thereby so realistic as possible.
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