WEEK 9 (INTRODUCTION TO ADOBE PHOTOSHOP)

Adobe Photoshop is a graphic editing  program developed and published by Adobe System Incorporated.

Adobe's 2003 "Creative Suite"  rebranding led to Adobe Photoshop 8's renaming to Adobe Photoshop CS. Thus, Adobe Photoshop CS5 is the 12 th major release  of Adobe Photoshop. The CS rebranding also resulted in Adobe offering numerous software packages containing multiple Adobe programs for a reduced price. Adobe Photoshop is released in two editions: Adobe Photoshop, and Adobe Photoshop Extended, with the Extended having extra features available. Adobe Photoshop Extended is included in all of Adobe's Creative Suite offerings except Design Standard, which includes the Adobe Photoshop edition.

Photoshop has ties with other Adobe software for media editing, animation, and authoring.

The .PSD (Photoshop Document), Photoshop's native format, stores an image with support for most imaging options available in Photoshop. These include layers with masks,color spaces,ICC profiles, transparency, text, alpha channels and spot colors,clipping paths, and duotone settings. This is in contrast to many other file formats (e.g. .EPS or .GIF) that restrict content to provide streamlined, predictable functionality. PSD format is limited to a maximum height and width of 30,000 pixels. .PSB (Photoshop Big) format, also known as "large document format" within Photoshop, is the extension of PSD format to images up to 300,000 pixels in width or height. That limit was apparently chosen somewhat arbitrarily by Adobe, not based on computer arithmetic constraints (it is not close to a significant power of two, as is 30,000) but for ease of software testing. PSD and PSB formats are documented.

Photoshop's popularity means that the .PSD format is widely used, and it is supported to some extent by most competing software. The .PSD file format can be exported to and from Adobe Illustrator, Adobe Premiere Pro, and After Effects, to make professional standard DVDs and provide non-linear editing and special effects services, such as backgrounds, textures, and so on, for television, film, and the Web. Photoshop is a pixel-based image editor, unlike programs such as Macromedia FreeHand (now defunct), Adobe Illustrator, Inkscape or CorelDraw, which are vector-based image editors.

Photoshop uses color models RGB, lab, CMYK, grayscale, binary bitmap, and duotone. Photoshop has the ability to read and write raster and vector image formats such as .EPS,.PNG, .GIF and .JPEG.

CS3

New productivity features include a streamlined interface, improved Camera RAW support, better control over print options, enhanced PDF support, and better management with Adobe Bridge. Editing tools new to CS3 are the Clone Source palette and nondestructive Smart Filters, and other features such as the brightness and contrast adjustment and Vanishing Point module were enhanced. The Black and White adjustment option improves control over manual grayscale conversions with a dialog box similar to that of Channel Mixer. Compositing is assisted with Photoshop's new Quick Selection and Refine Edge tools and improved image stitching technology.CS3 Extended contains all features of CS3 plus tools for editing and importing some 3D graphics file formats, enhancing video, and comprehensive image analysis tools, utilizing MATLAB integration and DICOM file support.

Resizing an Image

Most publishing applications offer two ways to resize an image:
• Scaling — selecting a scale tool and specifying a percentage or dimensions
• Stretching — selecting the image object and using "handles" to stretch or shrink it.

If you scale an image without changing resolution, pixels are added or deleted. The image blurs andedges become jagged. Details in the image sometimes disappear during scaling.

Stretching an image by grabbing image handles moves pixels closer together when you reduce the size of a digitized image and farther apart when you enlarge it, which also causes blurred images with rough edges.

In general, never enlarge a digitized image. Use scaling instead of stretching to reduce the size of an image.

Resolution of an Image

For computer presentations, use an image resolution of 72 dpi, first, because display screens are usually low resolution — only 72 dpi. Even if the monitor settings are set to 1280 x 1034, the screen is still 72 dpi. The resolutions are set in the graphics hardware installed in the computer. 

The physical resolution is 72 dpi of the monitor, so a 300 dpi image is usually unnecessary. Second, if your image resolution is higher than necessary, advancing slides and displaying special effects will be slow. Web images are measured in pixels. For best results, start with a 300‐dpi image at the same pixel dimensions it will have on a webpage and allow your photo software to resample it to 72 dpi, usually with a "Save for Web" selection. Animations are also 72 dpi.

Sometimes only a low‐resolution image is available for use in high‐resolution output. One way to handle this problem is to shoot a slide of the image and then scan the slide to the desired resolution and size.

                                      
                                                    (Self Review) 

                                  

Pixel

• is going to use through web or to view via monitor only
• Not for printing 

Iches

• for print image

The best resolution is 72. But why?

• Reflection of computer screen . Monitor screen will reflect our eyes. 
• For example same like pictures on laminating paper and the pictures on the paper which is not laminating. The laminating one show it is good quality. Actually both pictures is same quality. It is only because of the reflection.
• Another example is printing pictures using A4 paper and using glossy paper. The pictures which is printed on the glossy paper show more quality. But it is actually reflection from our eyes.

Setting of color :

1. RGB is for view only. It is use in setting of monitor color.

2. CMYK is used setting for print.