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Techniques Of Visualisation ARLA1040

Workshop One

Time and Space: Introduction to photoshop + autocad

Objectives

To gain confidence and competence in file management, Photoshop interface, opening and resizing images, moving photographs, layer systems, scripts, and saving. Importing images into AutoCAD and beginning to use drawing commands. Drawing simple entities in AutoCAD. Printing to PDF format and uploading to LMS.

Note: this exercise is not intended to be completed perfectly, but is intended to help you learn important base skills in each program. We do not expect the trace drawing to be complete, but we expect you to have had a go at drawing a variety of shapes and linework using polylines. Make sure you manage your time in the workshop so that you do not spend too long in Photoshop and have time to get into AutoCAD and do some drawing.

Assessment

Files will be uploaded and marked after Workshop 2

0.5 mark   All sixteen images present in the montage at the correct size and resolution

2 marks   Judicious placement of images and layer control to make a montage that is centrally located on the page, and joined together with intent.

2.5 marks   AutoCAD line drawing that shows a series of polylines that carefully delineate part of the image. Demonstration that several different polylines have been used, including arcs.

File Management

Set up an ‘ARLA1040’ folder in your UWA OneDrive if you have not already.

Make some folders in your UWA OneDrive for ARLA1040 (Workshop 1, etc). Later, you can set up other folders for assignments and future workshops. Make sure you save files from now on into these folders. Copy the ‘raw images’ folder from LMS to the correct folder on your OneDrive.

Setting up a Photoshop document

Open Photoshop

Go to the File > New…

Under name, type montage_01

Make the width 210mm and the height 297mm (an A4 portrait sheet size)

Make the resolution 300 pixels/inch (print resolution) (MAKE SURE THIS IS PIXELS/INCH, NOT PIXELS/CM.)

Check the colour mode is RGB (colour mode for viewing onscreen). Note: if we were printing this document on paper, we would need to change the mode to CMYK.

Save as a .psd document ‘montage_01’

File > Save As

Resizing images

Resize images using Image Processor as outlined in the Technical Lecture. File > Scripts > Image Processor

Make sure the file type is TIFF and the images are resized to match the pixel dimensions.

W 591 px and H 443 px

Starting a montage

File > Open. Navigate to the folder ‘TIFF’ and use the shift button to help you select files – perhaps four or so at a time. They will all appear at the top of your screen. Click on montage_01 to make sure it is showing on the screen.

Pull one file down onto the screen, then, using the move tool (top of the toolbar), click the image and drag it onto the montage page. Note that this automatically opens a new layer. Close the image file, then repeat with the rest of the files.

Now, using the move tool and the layer palette to move layers underneath or over each other, organise all 16 images into a montage. You may wish to rename layers and turn them on and off to make it easier to organise.

You may wish to temporarily make layers transparent so you can see through to the one underneath to help arrange them. You will see that one image needs to be rotated (image‐image rotation)

Note: this is a very static image ‐ we are expecting much more dynamic montages for your first assignment!

Saving

Print (File>Print) the montage as an Adobe PDF or Microsoft PDF and save it in your Workshop One folder for later (this will be uploaded at the end of Workshop 2).

Save (File>Save As Copy) the montage as a .jpg image for importing into CAD.

Note: The .jpg file is a single image without layers – always save the original Photoshop file (.psd) too, in case you need to make changes later.

Open AutoCAD

Next, please open AutoCAD and start a new document.

Importing an image to AutoCAD

Type IM (for image) in the command line. Then click enter.

In the top left‐hand corner, use the small triangle pull‐down menu and choose "Attach image". Navigate to your .jpg montage. Press Enter twice to accept the default insertion settings. Double‐click the mouse wheel to zoom to extents to show the image.

Select the image with a left click, and then right‐click on the image, then click on Draw Order > Send to Back. Or type DRAWORDER, select the image and choose “Back”

Create a new layer named 0.1 and set it to red using the new layer button below. You may need to open the Layer Properties Palette by typing LA if you do not see the window below.

Make sure it is current, then start tracing the image, zooming in and out as needed, using polylines (type PL) that switch from straight to curved segments as needed.

Practise drawing polylines with straight‐line segments, arcs, arcs using the ‘second point’ function, closing polylines, ortho on and off, etc.

Note: You will only be drawing on one layer today, as you simply practise drawing in CAD. Next week, we will show you how to set up multiple layers with different‐coloured ‘pen’ lines and how to set up plot styles so that each layer prints at a different lineweight.

Plotting

Turn layer 0 off so that the image is not displaying, but the linework is.

Go to: Output > Plot (or type print)

Under printer/plotter, choose Adobe PDF

Set paper size to A4 and under Plot Area; what to plot, choose Window from the pull‐down menu. Click on ’window’, then draw a window by clicking with your mouse from the bottom left to the top right of your drawing. Check the boxes that say ‘Centre the plot’ and ‘Fit to paper’

Under plot style table (pen assignments), choose monochrome.ctb from the pull‐down menu. When the dialogue box comes up, say yes.

Under Plot Options, make sure only the box “Plot with Plot Styles’ is checked.

Select whether the drawing orientation should be landscape or portrait.

Click on ‘preview’ and make sure you have a preview of a black line drawing sitting centrally on a white page.

Click OK, then name the file ‘trace_01’ and save it to your personal folder for uploading later.