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In PS CS on a PC, my color working space is AdobeRGB98, and my images are in 16 bit mode. From these huge files, I want to create small jpegs for web viewing and sometimes higher resolutions files for off-line viewing. I don’t mind creating different jpegs for these purposes, and my intent is for both PC and Mac users to view the same jpegs at their highest quality. After much research and experiments, I remain unsure if I’m taking the right steps. Here are some suggestions/comments that I have come across, and their related questions.
Suggestion/comment 1: "Before converting to jpeg, use Image_Size to change to 72ppi first. This will significant cut down the file size."
Question 1: True or fiction? Is 72ppi the optimal resolution for jpegs to display on both PCs and Macs?
Suggestion/comment 2: "PCs and Macs have different gammas."
Question 2: Should (or can) anything be done to compensate for this gamma difference when creating jpegs so that they look good on both PCs and Macs?
Suggestion/comment 3: "There is an algorithm to incrementally upsample (at +10% increments) an image from low to high resolution for best interpolation. For down sampling from high to low resolution for a jpeg, the reverse algorithm should be applied, using either Image_Size, Save_As_Jpeg or Save_For_Web."
Question 3: True or fiction?
Suggestion/comment 4: "Covert from AdobeRGB98 (or other color working space) to sRGB first before creating the jpegs."
Question 4: I find that following this suggestion results in much better looking jpegs on my PC. But should the sRGB profile be attached with the jpeg and why? With the sRGB profile attached, will it make any difference how a jpeg may appear on a PC vs on a MAC?
Suggestion/comment 5: "Save_As_Jpeg and Save_For_Web use different algorithms to convert to jpeg."
Question 5: True or fiction? Save_For_Web definitely has many more options to choose from, but is the underlying conversion algorithm that different?
Suggestion/comment 6: "In Save_For_Web, select Uncompensated_Color (or some other choice) and Bicubic_Sharper (or some other choice)."
Question 6: Which Color and Bicubic interpolation are the best options? Should Browser_Dither be enabled?
Suggestion/comment 7: "You need to create different jpegs for web and off-line viewing, because a web browser can make a color and tonal difference."
Question 7: I understand that a web browser can influence how a jpeg’s size is displayed, but it is true or fiction about the color/tonal difference? If true, how should the different jpegs be created?
Thanks.
Suggestion/comment 1: "Before converting to jpeg, use Image_Size to change to 72ppi first. This will significant cut down the file size."
Question 1: True or fiction? Is 72ppi the optimal resolution for jpegs to display on both PCs and Macs?
Suggestion/comment 2: "PCs and Macs have different gammas."
Question 2: Should (or can) anything be done to compensate for this gamma difference when creating jpegs so that they look good on both PCs and Macs?
Suggestion/comment 3: "There is an algorithm to incrementally upsample (at +10% increments) an image from low to high resolution for best interpolation. For down sampling from high to low resolution for a jpeg, the reverse algorithm should be applied, using either Image_Size, Save_As_Jpeg or Save_For_Web."
Question 3: True or fiction?
Suggestion/comment 4: "Covert from AdobeRGB98 (or other color working space) to sRGB first before creating the jpegs."
Question 4: I find that following this suggestion results in much better looking jpegs on my PC. But should the sRGB profile be attached with the jpeg and why? With the sRGB profile attached, will it make any difference how a jpeg may appear on a PC vs on a MAC?
Suggestion/comment 5: "Save_As_Jpeg and Save_For_Web use different algorithms to convert to jpeg."
Question 5: True or fiction? Save_For_Web definitely has many more options to choose from, but is the underlying conversion algorithm that different?
Suggestion/comment 6: "In Save_For_Web, select Uncompensated_Color (or some other choice) and Bicubic_Sharper (or some other choice)."
Question 6: Which Color and Bicubic interpolation are the best options? Should Browser_Dither be enabled?
Suggestion/comment 7: "You need to create different jpegs for web and off-line viewing, because a web browser can make a color and tonal difference."
Question 7: I understand that a web browser can influence how a jpeg’s size is displayed, but it is true or fiction about the color/tonal difference? If true, how should the different jpegs be created?
Thanks.
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