It truly depends on what you want to do and your budget. Adobe Photoshop is available for macintosh, and is a professional, but expensive program. If you're looking for a job in graphics design, then this is a very good program to use. On the other hand, you may want a cheaper program to do simple editing like Acorn or Pixelmator. This is better if you only need to do low level editing or if you have a small wallet.
'Montage making software' would just be any video editing software. For Macs, iMovie is a really good video editing software and comes standard with all Macs.
image editing softwre
Image editing software.
multimedia
A photo editor
Image editing program or software, sometimes as image editor
Macs come with iMovie video editing software.
It is both. An 'application' is a type of software.
Adobe Photoshop is a graphics editing program. Image editing program.
The unsharp mask feature in image editing software enhances the clarity and sharpness of an image by increasing the contrast along the edges, making them appear more defined and crisp.
The purpose of the RGBAlpha channel in image editing software is to control transparency in an image. When it appears greyed out, it means that the transparency settings are not currently active or editable.
The option to adjust RGB Alpha values may be greyed out in the image editing software because the image does not have an alpha channel, which is needed to adjust transparency.