The following is a simple tutorial showing how to use Photoshop to create a CAD plan poster: Step 1: Import the CAD plan image - Open Photoshop, and import the CAD plan image. Click the "File" menu, select "Open" and then select your CAD plane image file. Step 2: Add a background color or texture - If you wish to add a background color or texture to your poster, you can use the Rectangle Tool to create a shape layer that covers the entire canvas. Then, use the Color Fill Tool or Pattern Tool to add the desired color or texture to the layer. Step 3: Adjust the size and position of the CAD image - This step is optional, you can use the transform tool to adjust the size and position of the CAD image according to the layout needs of the poster. Select the Transform Tool and drag the corners or edges of the image to fit it to your poster. Step 4: Modify the colors and lines of the CAD image - Select the CAD image layer, then click the "Image" menu and select "Adjustments" and "Hue/Saturation". You can modify the color of your CAD image by adjusting the hue, saturation, and brightness sliders. Additionally, you can further adjust colors and lines by creating new adjustment layers such as Levels or Curves. Step 5: Add text and callouts - Use the text tool to add the desired text and callouts to your poster. Select the Text tool and drag your mouse on the canvas to create a text box. Enter the text you want and adjust the font, size, and color of the text in the Character panel. Step 6: Add Shadows and Highlights - To make your CAD image look more realistic, you can use the shadow and highlight effects. Select the CAD image layer and click the Drop Shadow, Outer Glow, and Inner Glow buttons in the Layer Styles panel. Adjust the appropriate options to get the desired effect. Step 7: Save and Export - Finally, click on the "File" menu and select "Save" to save your poster. You can choose to save it in a variety of different file formats, such as JPEG, PNG or PDF. If you need to print, make sure you set the correct resolution and color mode. This is just a simple tutorial, you can also try other techniques and effects to create professional and unique CAD floor plan posters. Hope this helps!