Go to: https://web.stanford.edu/class/cs101/image-functions-reference.html
Links to an external site.
Go to the Code Area and erase what’s there.
In the Code Area, paste in the following code:

img = new SimpleImage("x.png");
img.setZoom(20);
print(img);

Now, edit the code to change only the white pixels in x.png to orange, so it looks like this:

Paste your code here.

Question

Go to: https://web.stanford.edu/class/cs101/image-functions-reference.html
Links to an external site.
Go to the Code Area and erase what’s there.
In the Code Area, paste in the following code:

img = new SimpleImage("x.png");
img.setZoom(20);
print(img);

Now, edit the code to change only the white pixels in x.png to orange, so it looks like this:

Paste your code here.

BlackTom AI · Accepted Answer

The task asks to edit the provided code so that only the white pixels in x.png are changed to orange. 
Starting with the original setup, the code creates an image object from x.png and sets a zoom level, which is fine since these lines are initial boilerplate for displaying the image. 
The key portion is the loop that iterates over each pixel in the image: for (pixel of img) { ... }. This pattern allows inspection and modification of every pixel one by one. 
Inside the loop, there is a conditional check: if (pixel.getRed() == 255 && pixel.getGreen() == 255 && pixel.getBlue() == 255) { ... }. This condition precisely matches pixels whose red, green, and blue components are all at their maximum (RGB 255, 255, 255), i.e., pure white pixels. 
When a pixel is white, the code sets the red component to 255 (staying full red), the green component to 165, and the blue component to 0. This combination (255, 165, 0) corresponds to the color orange, so the white pixel is transformed to orange as intended. 
If a pixel is not pure white (for example, shades that are not exactly 255 for all three channels), the condition fails and the pixel remains unchanged, which aligns with the requirement to change only white pixels. 
A potential limitation to note is that anti-aliased edges or PNGs with near-white pixels due to compression might not be caught by the strict equality to 255, 255, 255. If those near-white pixels should also be orange, you’d need a tolerance check (e.g., values within a small range of 255). 
Additionally, the code maintains the rest of the image untouched, preserving the black background and any non-white elements. 
In summary, the logic correctly identifies pure white pixels and recolors them to orange, matching the stated goal, while preserving all other pixels unchanged. 
Edge cases to consider: if selective whitening is desired (e.g., inclusive of near-white pixels), adjust the condition to include a tolerance; if the image uses a different color model or subtle color values for white, the current exact check would need adaptation.

I&C SCI 10 LEC A: HOW ... Lecture 7 Pre-work: Editing Only Some Pixels

查看解析

登录即可查看完整答案

类似问题

In a consumer society, many adults channel creativity into buying things

Economic stress and unpredictable times have resulted in a booming industry for self-help products

People born without creativity never can develop it

A product has a selling price of $20, a contribution margin ratio of 40% and fixed cost of $120,000. To make a profit of $30,000. The number of units that must be sold is: Type the number without $ and a comma. Eg: 20000

Which of the following statement regarding cost is correct:

Under the assumptions used in cost-volume-profit analysis, as the activity increases:

The CVP and break-even analysis are supported by a range of important assumptions. Which of the following is not an assumption of the CVP:

The break-even point is that at which:

更多留学生实用工具

考试浏览器助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单