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this was the first photoshop made
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Photoshop 2.0 included the Path feature, which allowed users to trim around an object easily and to save that path for future use
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the new thing in photoshop 3.0 was the layers
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Adjustment layers and macros were the two most notable features of Photoshop 4.0.
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The two most important features released with 5.0 were editable type and the ability to undo actions multiple times in the “History” palette.
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The layer styles panel made working with layers even easier in Photoshop 6. Vector shapes were also added in this release; the ability to draw vector shapes such as arrows into a bitmap was lauded by users.
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Version 7.0 introduced the healing brush and text that was fully vector-based.
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Photoshop CS was the first to employ the CDS (counterfeit deterrence system) which recognized and refused to allow duplication of paper currency.
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The red eye removal tool, previously exclusive to Elements, was popular enough to make an appearance in the core version of Photoshop.
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The most notable new feature was graphic optimization for mobile devices
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The Masks and Adjustments panel was added. CS 4 also dealt with edges on masks more effectively. Colour correction took a huge step forward with this release.
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CS5 introduces new tools such as the Content-Aware Fill, Refine Edge, Mixer Brush, Bristle Tips and Puppet Warp.
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added new creative design tools and provided a redesigned interface with a focus on enhanced performance.
