Pixelmator is so-so. Although fine for general image editing, it lacks important features which make it unsuitable for more serious work: no Lab colour space, no 32bpc, no EXR support, no HIS workflow (which is neither supported in Photoshop, btw), no standard Photoshop plugin support, the curves dialog is simplistic, layers cannot be instanced, a layer mask is still intrinsic part of a layer (same issue in Photoshop), …
And only available for Mac.
If anyone is on the lookout for a viable professional alternative, Photoline will provide what you seek:
– full 16 and 32bpc Lab, RGB, CMYK, and greyscale support,
– 47 non-destructive adjustment layers,
– 18 layer effects,
– multi-layered EXR import and export (not available in Photoshop, and the ProEXR plugin has issues with large EXR files),
– instanced layers that update in realtime when the source layer is edited,
– layer masks that behave as regular layers(!) (can be grouped, and instanced!)…
All functions, adjustments, effects, filters, layers and masks work with 8-bit, 16-bit, and 32-bit images. Liquify is non-destructive and stackable. Bitmaps can be converted to vector.
Layers in Photoline can be any bit-depth and colour space COMBINED in the same layer stack! No more need to switch image mode!
All transformations are non-destructive by default. All the retouching tools of Photoshop are available, and some original ones as well (filter brush).
And colour corrections (curves, levels, etc.) can be made in RGB, Lab, HIS, and HSV colour spaces without the need for image mode switching as well. This alone offers such a freedom compared to Photoshop.
And multiple page support!
Downsides? No 3d or video components. Painting is not as good as Photoshop. Photoline works really well with Krita (open source, and Krita arguably offers a much improved painting and drawing experience compared to Photoshop).
And Photoline can turn just about any other image editing tool (including vector applications such as InkScape) into a “plugin” through its round-tripping app connection functionality.
It IS on par with Photoshop in terms of image editing power. And outpaces it in a number of vital areas (layer system, HIS workflow, and others).
All that, and for some obscure reason it is still one of the web’s best kept secrets.
https://www.pl32.com
Inexpensive, and a full license to own for both Mac and Windows. Photoline runs off a USB stick, if required. The website looks horrid, but the tool is excellent.
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System: Win7 64bit – i7 920@3.6Ghz, p6t Deluxe v1, 48gb (6x8gb RipjawsX), ATI 7970 3gb, EVGA 590 3GB, Revodrive X2 240gb, e-mu 1820. Screens: 2 x Samsung s27a850ds 2560×1440, HP 1920×1200 in portrait mode