What’s new in Photoshop CS4

Adjustments panel

Quickly access the controls you need to non-destructively adjust image color and tone in the Adjustments panel. Includes on-image controls and presets in one location. See Adjustments panel overview.

Masks panel

Quickly create precise masks in the Masks panel. The Masks panel offers tools and options for creating editable pixel- and vector-based masks, adjusting mask density and feathering, and selecting non-contiguous objects. See Masking layers.

Advanced compositing

Create more accurate composites using the enhanced Auto-Align Layers command, and use the spherical alignment to create 360-degree panoramas. The enhanced Auto-Blend Layers command smoothly blends color and shading, and extends your depth of field by correcting vignettes and lens distortion. See Retouching and transforming.

Canvas rotation

Click to smoothly turn your canvas for nondestructive viewing at any desired angle. See Use the Rotate View tool.

Smoother panning and zooming

Gracefully navigate to any area of an image with smoother panning and zooming. Maintain clarity as you zoom to invididual pixels, and easily edit at the highest magnification with the new Pixel Grid. See Viewing images.

Better raw processing in Camera Raw

Apply corrections to specific areas of an image using the Camera Raw 5.0 plug-in, enjoy superior conversion quality, and apply postcrop vignettes to images. See Camera Raw.

Improved Lightroom workflow

Enhanced integration between Photoshop CS4 and Photoshop® Lightroom® 2 allows you to open photos from Lightroom in Photoshop and seamlessly roundtrip back to Lightroom. Automatically merge photos from Lightroom into panoramas, open as HDR images, or open as multilayer Photoshop file.

Efficient file management with Adobe® Bridge CS4

Enjoy efficient visual asset management with Adobe Bridge CS4, which features faster startup, workspaces that suit the task at hand, and the ability to create web galleries and Adobe PDF contact sheets. See Working with Adobe Bridge.

Powerful printing options

The Photoshop CS4 print engine provides tight integration with all the most popular printers, the capability to preview out-of-gamut image areas, and support for 16-bit printig on Mac OS. See Printing.

3D acceleration

Enable OpenGL Drawing to accelerate 3D operations. See About OpenGL.

Comprehesive 3D tools

Paint directly on 3D models, wrap 2D images around 3D shapes, convert gradient shapes to 3 objects, add depth to layers and texxt, and enjoy exporting to common 3D formats. See 3D and technical imaging.

Higher performance on very large images (Windows only)

Work faster with very large images by taking advantage of additional RAM. (Requires a 64-bit computer with a 64-bit version of Microsoft Windows Vista®).

To download : Photoshop help (pdf)

Learn how to do spot color separation for screen print production in Photoshop

Using the Apply Image Command

A considerable number of Photoshop users shy away from the Apply Image command because they fail to see its usage. It’s actually a very powerful command (Figure 6-12) for applying blends between two documents. You can use it to blend not only layers but also channels between the source document and the target document. Furthermore,you can apply the blending through a channel, selection,or mask; the channel can be a color channel or an alpha channel.

To use Apply Image,open the two documents that you want to blend. Make sure that they both have the same pixel dimensions (Image➜Image Size) and then take the following steps:

1. Select the document that you want as the target (the blending will be applied to this document).
   
2. Choose Image➜Apply Image.
3. In the Apply Image dialog box,select the source file from the Source pop-up menu.
4. Next,select a layer and channel from the Layer and Channel pop-ups.
5. In the Blending section, select a blend mode from the pop-up and specify an opacity level, or leave it at 100%.

At this stage, you can click OK and exit or continue if you want to apply the blend through a mask.

1. Check the Mask box.
2. Select the document that you want to use as the source for the mask from the Image pop-up.
3. Choose a layer as the source for the mask from the Layer pop-up,or leave it on Merged.
4. Choose a channel or alpha channel from the Channel pop-up, or leave it on Gray for default composite channel. If you selected an alpha channel, you can invert the mask by checking the Invert box. You are not restricted to inverting only the alpha channel; you can invert the single channels or the composite channels.
5. Click the OK button to apply the blend.

Note: If you’re using another image as the source, the pixel dimensions of thesource and the target images must match. If the color modes of the source and targetimages differ, you can blend single channels but not the composite channels. For example,if you like the detail on the black plate of a CMYK file, you can blend the Black channelfrom the CMYK (source) image into the composite of the RGB (target) image, or the Lchannel from a document in Lab mode.

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