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How to Change Image Background Color in Adobe Reader on iPhone
Question details
The user wants to invert the colors of a photo embedded in a document (black background with white text to white background with black text) using a mobile PDF reader.
- Product
- Adobe Acrobat Reader Mobile
- Device & OS
- iOS
- Scenario
- Attempting to edit the background color of an image inside a PDF file directly from an iPhone.
- Observed behavior
- Adobe Acrobat Reader Mobile functions only as a free PDF viewer and annotator, providing no built-in tools to edit picture properties or change image background colors.
Verify whether the file you are viewing is a standard PDF or an image file (like JPG or PNG). Free mobile PDF viewers lack image editing capabilities, so you will need a photo editing application to invert the colors before re-inserting the image into your document.
Invert Image Colors Using Native iOS Tools Before PDF Creation
Since Acrobat Reader Mobile cannot edit images, the most effective workaround is to modify the image using your iPhone's built-in tools before adding it to your document.
Adobe Acrobat Reader Mobile is a freeware application designed strictly for viewing, reading, annotating, and signing PDFs. It does not possess the capacity to alter core image properties such as inverting colors.
To achieve a white background with black text, you must extract or save the image to your camera roll and process it through a photo editor.
If the image is not already on your device, take a screenshot of the image within the PDF and crop out the surrounding document.
Navigate to the Photos app on your iPhone and open the saved image.
Tap 'Edit' in the top right corner. Use the built-in filters (such as 'Black & White' or 'Noir') and adjust the Exposure and Brilliance sliders to attempt a color reversal, or use a dedicated free third-party photo editing app with an 'Invert Colors' feature.
Once the image has a white background and black text, save it. You can now use a PDF creator tool to convert this edited image back into a PDF document.
Edit the PDF Image Externally via Desktop Software
If you have access to a desktop computer, you can utilize advanced PDF editors to pass the image directly into an image editing program like Photoshop.
Easily Extract and Replace PDF Images with WPS Office
While basic mobile viewers restrict your editing capabilities, WPS Office provides a comprehensive suite of PDF tools. You can easily manage, extract, and replace images within your PDFs to seamlessly update your documents across all your devices.
- 1. Download WPS Office: Install WPS Office on your iPhone or desktop device and open your target PDF file.
- 2. Extract the Image: Navigate to the PDF editing tools, select the image with the black background, and save/extract it to your local device storage.
- 3. Invert the Colors: Use your device's native photo editor to invert the image colors to a white background.
- 4. Replace the Image in PDF: Return to WPS Office, select the original image, and use the 'Replace Image' function to swap it with your newly edited file.
Frequently Asked Questions
Can I edit the text inside an image using a PDF reader on my iPhone?
No, standard PDF readers cannot edit text that is rasterized within an image. You must first use an OCR (Optical Character Recognition) tool to extract the text from the image, converting it into editable digital text.
Is there a way to temporarily invert PDF colors for easier reading at night?
Yes, many mobile PDF readers, including WPS Office, feature a 'Dark Mode' or 'Night Reading' mode. This temporarily inverts the screen colors (black to white and vice versa) to reduce eye strain, but it does not permanently alter the file.
Why am I unable to select the image in my PDF?
If a PDF is created from a scanner or flattened during export, the entire page acts as a single image layer. You cannot select individual graphical elements unless you use a premium PDF editor with element-selection tools.
