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Study finds saturation in images is key to marketing menu items

The food in the more highly saturated photos looked fresher and tastier to participants, and that led them to be more likely to purchase the food.

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An appealing photo of a pizza or other menu item can help a restaurant increase sales – especially if the right filter is used, a new study suggests. This is because photos high in color saturation make food look fresher and tastier to viewers, which increases their willingness to order the menu items.

Color saturation refers to the intensity of the color in the image – the vividness and richness of the reds and greens and blues.

But how well color saturation works to make food appealing depends on the visual distance of the food in the photo – and even on whether consumers plan to dine alone or with others.

In the cutthroat restaurant business, these results provide a simple method to increase sales, said Stephanie Liu, lead author of the study and associate professor of hospitality management at The Ohio State University.

“On Instagram, it means using the ‘X-Pro II’ filter on your food photos rather than the ‘Earlybird’ filter,” Liu said. “It is not difficult and doesn’t cost a dime, so it is an easy win for restaurant marketers.”

The study was published in the Journal of Business Research.

The researchers did two online studies.

In one study, 267 participants were asked to imagine themselves browsing through options on an online food ordering platform. They were shown photos of a poke bowl, a Hawaiian dish featuring chunks of raw, marinated fish, vegetables and sauce over rice.  They were from a fictitious restaurant named Poke Kitchen.

Study participants were randomly assigned to view one of the four different photos with either high or low color saturation and either close or farther away visual distance.

The photos with high color saturation were edited with professional graphic design software to be 130% more saturated than the low-saturation photos. The up-close photos were 130% larger in radius and appeared nearer to the observer than the more distant photo.

Participants were asked to rate how fresh the food in each photo looked, how tasty it looked and how likely they would be to purchase it.

The food in the more highly saturated photos looked fresher and tastier to participants, and that led them to be more likely to purchase the food, results showed.

But color saturation had a stronger effect when the food appeared more distant in the photos, Liu said. “When the food is shown close up, it is already easy for the viewers to imagine how fresh and tasty the food would be,” she said. “Color saturation is not as necessary.”

The second study involved 222 online participants.  In this case, the participants were asked to imagine they were browsing Instagram and came across images of pizza from a fictitious restaurant near their home named Pizza City. They were shown photos either high or low in color saturation.

People in the study were also told they would either be eating alone or with family that night and were again asked to rate the pizza on perceived freshness and tastiness and on whether they would likely purchase the menu item.

As in the previous study, the food in the color-saturated photo was always seen as fresher and tastier and one that people would be more likely to buy.  But that effect was stronger for people who were told they would be eating alone and weaker for those who would be eating with family.

“When people are eating with others, the social experience is a big part of what people look forward to,” Liu said. “But when they anticipate eating alone, they focus more on the food itself. They want the food to be fresher and tastier and that’s why color saturation is more important in this context.”

These findings are more important now than ever before, with people ordering online and looking at photos to help them decide what to eat, Liu said.

“Restaurants have to post pictures of their food on social media and online ordering platforms,” she said. “They should be paying as much attention, or maybe more, to the photos they post as they do to the text. Color saturation is one key element they need to focus on.”

Co-authors on the study were Laurie Luorong Wu of Temple University, Xi Yu of the City University of Macau and Huiling Huang of the University of Macau in China. Xi Yu and Huiling Huang are recent doctoral graduates of the hospitality management program at Ohio State.

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Modern slavery is a business decision – not an accident

Many organisations focus on compliance, reporting and audits, yet fail to build the relationships and trust needed to identify and tackle exploitation. In some cases, competitive pressures and mistrust between firms actively prevent collaboration that could reduce risks. 

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Modern slavery persists because the way global supply chains are designed allows it to remain hidden, according to new research led by Professor Glenn Parry from the University of Surrey and Dr Mike Rogerson at the University of Sussex.  The findings argue that exploitation often stems from business decisions that cut costs by pushing work further down the supply chain, leaving companies with little direct contact with workers and less visibility over how they are treated. 

Around 27 million people worldwide are estimated to be living in conditions of modern slavery, embedded within the production of everyday goods and services. While governments have introduced laws to force companies to report on risks, the research suggests that disclosure alone is not changing behaviour in a meaningful way. 

Instead, firms often maintain distance from the most vulnerable parts of their supply chains. This distance can be geographical, organisational or even digital, such as the use of algorithms that control workers without direct oversight. As a result, companies rely on indirect signals rather than engaging directly with workers, leaving serious gaps in knowledge and accountability. 

The special issue on “Modern Slavery and Supply Chain Management”, published in Supply Chain Management, brings together insights from multiple international studies across sectors including construction, social care, logistics and global manufacturing. Drawing on interviews with practitioners, workers and experts, as well as analysis of corporate reports and policy frameworks, the work examines how governance, partnerships and digital systems shape labour conditions across complex supply networks. 

Glenn Parry, co-editor of the issue and Professor of Digital Transformation at the University of Surrey, said: “Modern slavery is a problem buried in supply chain structures and it is often the result of how those chains are built and managed. When companies prioritise cost and efficiency above all else, they create the conditions where exploitation can thrive.”

The research found that many organisations focus on compliance, reporting and audits, yet fail to build the relationships and trust needed to identify and tackle exploitation. In some cases, competitive pressures and mistrust between firms actively prevent collaboration that could reduce risks. 

It also finds that partnerships between businesses, governments and NGOs can help, but only when they are built on genuine understanding and shared goals. Superficial collaboration risks becoming a tick-box exercise rather than a driver of real change. 

A major recommendation is to shift focus from reporting to knowledge. Companies need to invest in understanding their supply chains in depth, including listening directly to workers. Bringing “upstream voices” into decision making is seen as critical to designing effective anti-slavery measures. 

Professor Glenn Parry added: “If we are serious about tackling modern slavery, we need to stop treating supply chain complexity as an excuse. It is often a choice. That means it can be changed.” 

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Long-serving CEOs may weaken innovation, study finds

Companies led by long-serving chief executives may become less innovative over time unless challenged by strong independent boards.

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A new study from the University of East London has found that companies led by long-serving chief executives may become less innovative over time unless challenged by strong independent boards.

The research examined 215 FTSE 350 companies over an 11-year period between 2010 and 2021. It explored how CEO tenure and independent directors influence a company’s “R&D knowledge stock”, which is the research, expertise and technological capability built through investment in innovation.

The study published in the journal Corporate Governance found that CEOs who remain in office for many years often become more cautious and less willing to back risky research and development projects. These companies were more likely to reduce investment in innovation and long-term technological growth.

Firms with higher numbers of independent directors were more likely to continue building innovation capacity with experienced CEOs and independent directors forming an effective partnership, to combine deep company knowledge with outside challenge.

However, both experienced CEOs and independent directors become more cautious and less willing to back risky research and development projects when the company fails to meet performance aspirations, suggesting that independent directors do not have stable risk preferences.

The findings suggest that innovation is shaped not only by technology and finance, but also by leadership culture and corporate governance structures.

Author Dr Igbekele Sunday Osinubi, of the Royal Docks School of Business and Law, said: “Long-serving CEOs can bring valuable experience and stability, but there is also a risk that leaders become too cautious or too attached to existing ways of thinking. Our findings show that independent directors play an important role in encouraging companies to continue investing in innovation, especially during difficult periods when firms may otherwise retreat from long-term research and development.”

He added: “This matters beyond individual companies. Innovation drives productivity, competitiveness and economic growth. The study highlights how governance structures can influence whether firms continue building the knowledge and technologies that shape future industries.”

The paper argues that regulators and policymakers should consider governance reforms and incentives that encourage long-term innovation strategies, particularly in firms led by long-serving executives. The findings may also influence how boards think about CEO succession planning, oversight and the balance between short-term financial pressures and long-term investment.

Osinubi’s research, “Long CEO tenure, independent directors and R&D knowledge stock: the moderating effect of performance shortfalls”, was published in the Corporate Governance: The International Journal of Business in Society

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Office owners or managers, take note: Increased risk of bullying in open-plan offices

In traditional open-plan offices it is easier to notice colleagues’ shortcomings and become irritated by them. If someone gets frustrated and takes it upon themselves to “do something about” a colleague’s behaviour, and there are no clear guidelines for handling such situations, there is a risk that it may escalate into bullying. Those who are subjected to bullying lack access to a private space for retreat. 

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Open-plan offices entail a clearly increased risk of workplace bullying compared with employees having their own office or sharing with just a few colleagues. This is shown in research from Linköping University, Sweden. 

“Increased bullying is a tangible negative consequence of how you choose to organise the workplace. It’s important to highlight this, as it hasn’t previously been examined,” says Michael Rosander, professor at the Division of Psychology at Linköping University.

Open-plan offices, where many employees share the same space, have become increasingly common. Employers often justify this development as a way to use premises more efficiently and to encourage creative interactions between employees. However, research has shown that open-plan offices do not promote health, job satisfaction or productivity.  

Until now, it has been unclear whether open-plan offices also affect the risk of bullying and employees’ motivation to look for another job. Through surveys of more than 3,300 randomly selected individuals in employment in Sweden, Michael Rosander has now provided an answer. The results are published in the journal Occupational Health Science. 

Thirty per cent of those with some form of office-based work reported that they worked in a traditional open-plan office with no access to private space. Thirteen per cent worked in so-called activity-based offices, where employees spend part of their time in an open-plan environment but also have access to designated rooms for tasks requiring peace and quiet. The remainder had their own office or shared one with only a few colleagues.

For traditional open-plan offices, the survey responses showed a clearly increased risk of bullying compared with those who had their own office or shared an office with only a few colleagues. The difference remained regardless of factors such as personality traits and the extent of remote working. This suggests that the problems are indeed caused by the work environment in the office.  

The researchers’ explanation is that in traditional open-plan offices it is easier to notice colleagues’ shortcomings and become irritated by them. If someone gets frustrated and takes it upon themselves to “do something about” a colleague’s behaviour, and there are no clear guidelines for handling such situations, there is a risk that it may escalate into bullying. Those who are subjected to bullying lack access to a private space for retreat. 

Activity-based open-plan offices, by contrast, showed no increased risk of bullying, likely due to the availability of private spaces. However, in both types of open-plan office, employees were more likely to consider changing jobs. One possible explanation is that activity-based offices also involve more distractions, according to Michael Rosander.

For employers who have introduced, or are planning to introduce, open-plan offices, there are some lessons to be learned. One is to be prepared to deal with irritation and conflicts before they escalate. Another is the importance of providing rooms where employees can work undisturbed. Placing individuals with similar needs and tasks near one another may also reduce the risk of disruption.

“Traditional open-plan offices are in themselves negative for the individual, for productivity, and make people more likely to leave their job. Social interaction also suffers. So it’s worth considering how to handle it,” says Michael Rosander.

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