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Quantifying Colour Difference Thresholds on Modern Displays

   Centre for Technical Textiles

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  Dr Kaida Xiao  No more applications being accepted  Funded PhD Project (UK Students Only)

About the Project

Key facts

Deadline - Friday 6 January 2023

Funding start date - Sunday 1 October 2023

Number of funding places - 1

Country eligibility - UK only

Source of funding - University of Leeds


LITAC (Leeds Institute of Textiles and Colour) hosted by the School of Design, is offering a highly competitive PhD scholarship consisting of the award of tuition fees and an annual maintenance stipend that matches UKRI rates (17,668 GBP in 2022/23) along with a significant element of training and development expenses also incorporated within the Scholarship package.

With the improvement in modern display technology (including TV, computer and mobile phones), one of the big challenges we now face is colour image reproduction across different media and devices. This is because the variation between different devices has become much greater. Colour-difference threshold or colour-difference ellipses in colour space can represent perceptible and tolerable colour differences respectively. Quantifying the colour-difference threshold on modern displays is of importance for science, technology and well-being.

The aim of the proposed study is to subjectively assess the perceptible and acceptable colour difference of images and text on modern displays through a psychophysical experiment, and to develop a model to objectively define the colour-different ellipse in a uniform colour space. Our special focus would be on the colour difference between images, such as textiles, landscapes, and facial images; and between text with different purposes (headings, main text, secondary text, etc). 

Entry requirements

Applicants must have a strong Colour/ Imaging/ Information Design / Lighting background, with a good understanding of psychophysical experiments is also desirable.

Applicants applying for research degree programmes should normally have at least a first-class or an upper second-class British bachelor’s Honours degree (or equivalent) in Colour Science, Image Science, Information Design, Lighting Technology, Psychology or another appropriate undergraduate or Masters discipline.

English language requirements

The minimum English language entry requirement for research postgraduate research study in the School of Design is an IELTS of 6.5 overall with at least 6.0 in each component (reading, writing, listening and speaking) or equivalent. The test must be dated within two years of the start date of the course in order to be valid.

Other Conditions:

Applicants must not have already been awarded or be currently studying for a doctoral degree.

Applicants must live within a reasonable distance of the University of Leeds whilst in receipt of this scholarship.

How to apply

Stage 1

First, apply for a research place of study, through the online application form. Please state clearly that the funding you wish to be considered for is ‘LITAC - Quantifying Colour Difference Thresholds on Modern Displays’ with Dr Kaida Xiao, Professor Maria Lonsdale, and Yan Lu as your proposed supervisors. You will be expected to meet our eligibility criteria for PHD candidates.

Once you have received your student ID number (a 9-digit number) move onto stage 2.

Stage 2

Apply for the LITAC Project – ‘LITAC - Quantifying Colour Difference Thresholds on Modern Displays’ by completing the Scholarship Application Form. You must submit your scholarship application by 17.00 p.m. on Friday the 6th of January 2023.

Contact details

For further information related to the application process please email the Faculty PGR Admissions Team at [Email Address Removed]

For further information related to the project please contact Dr Kaida Xiao at [Email Address Removed]

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