DH2320 Lab 2

Photoshop techniques

The aim with this lab was to gain experience using Photoshop as a restoration and creativity tool. Below you can see the results of the different altered images, showing also images for each step in the process. Hover with the mouse over the thumb-nails to show a bigger version of each step.

Color and levels adjustments

The image mostly needs a color correction (2). The edges has a slightly ligther tone than the middle so a radial gradient darkening layer (3) was added. Finally the contrast was enhanced by adjusting the levels (4).

1. Original

2. Darken edges

3. Color correction

4. Levels adjustment

Scratch removal

Scratches were removed with the clone stamp tool.

1. Original

2. Clone stamp tool

Color replacement

The color of the pink flowers was changed to a blue color using the color replacement tool (2).

1. Original

2. Color replacement

Shadow and comosition correction

This image had a lot of hard edges and black areas. Some shadows were removed by utilizing the clone stamp tool (2). The door opening on the left did not contain enough information to restore. Instead the composition of the image was changed in order to make the image more interresting (5).

1. Original

2. Clone stamp tool

3. Color levels

4. Levels adjustment

5. Image crop

Model retouching

The aim with this exercise was to "improve" the appearance of the model. This was done with the liquify tool (2) and then covering the distortion with the clone stamp tool (3). To further improve the composition the image was then cropped (4).

1. Original

2. Liquify tool

3. Clone stamp tool

4. Image crop

Creating a seamless tile

Making a seamless texture from a regular image involves several tricky steps. First the image was transformed to a uniform size (2). Anything that may stand out in the image and destroy the illusion, such as shadows and stains, was removed with the clone stamp tool (3). For a convincing result it is important that the illumination is uniform over the image. The high pass filter in combination with a luminosity blending was used to achieve this (4). The image is then shifted horizontally and vertically with the offset filter in order to fix a seamless edge with the clone stamp tool (5 & 6). The vertical transform in the last step may be set earlier.

1. Original

2. Transformation

3. Clone stamp tool

4. High pass filter, luminosity blending

5. Offset filter, clone stamp tool

6. Transform, offset filter, clone stamp tool

Below under "Real time visualization" you can see how the texture looks mapped on to a 3D cube.

Montage and design

Photoshop is a powerful tool for creating posters. I used the functions in Photoshop to create a poster of the teacher of the course, inspired by the famous Hope poster of Barack Obama.

The image was first converted to gray scale and then cut from the background with the lasso tool & eraser (2). The number of colors was reduced to 5 by using the posterize filter (3). The image was adjusted to make it more stylized, and one color was exchanged for a horizontal line pattern using a halftone pattern with masking (4). The image was then colored by using a gradient map (5).

1. Original

2. Lasso tool & eraser

3. Posterize filter

4. Halftone pattern with masking

5. Gradient map

Real time visualization

The link below takes you to an example of using the texture on a 3D object. The demo uses WebGL and contains a cube onto which the seamless texture from the example above is mapped.

WebGL 3D texture mapping demo